Very slow file-access - Opinions?

I have configured a VPN using Cisco 857 routers. There are three sites with two of them being ?spoke? sites and one being the ?hub?. The Hub site also accepts VPN client dial-in.
It all seems to work fine, however I have a question regarding performance more around the available bandwidth than anything. The Hub site is an ADSL router and the upstream connection (which is effectively the other sites downstream connection) is rated at minimum of128kb/s (but I get around 170kb/s of actual file transfer so it?s a fair bit more than that).
The problem is opening files on a Microsoft server across the link is painfully slow. I did a packet capture and to open a 35KB file the traffic back and forward across the MS ?direct hosting? or AD port 445 ends up being around 215KB for the transaction. Talk about overhead!
All other stuff seems to be acceptable across the VPN links e.g. domain authentication, email etc, but then that is either relatively small or not real-time unlike opening your MS Word document. Realistically I guess the available bandwidth is insufficient for this purpose being at best about 60 times slower than a 10MB Ethernet.
What is everybody elses thoughts/experience with this? We can upgrade the plan to a maximum of 512kb/s uplink but I guess the best solution would be a MS terminal server or Citrix server?
Thanks

Thanks, I might look at this technology next time. In the end we put a MS terminal server in for users at the satellite sites to connect to and they are very happy with that performance as its just screen, mouse and keyboard traffic going across the WAN.
BTW if anybodys interested, if you are running SBS2003 you can put in a Windows 2000 server as a terminal server, and you only have to pay for a Windows 2000 server license; user CALS and TS CALS are legally provided by the SBS2003 server (if you use a Windows 2003 server as the TS you have to pay for TS CALS which are really expensive). We did this to keep costs down for our TS solution.
http://go.microsoft.com/fwlink/?LinkId=49921

Similar Messages

Very very slow file access iSCSI NSS on SLES11/XEN/OES11

Hi,
Like many Novell customers while carrying out a hardware refresh we are moving off traditional Netware 6.5 to OES11 and at the same time virtualising our environment.
We have new Dell Poweredge 620 serves attached by 10gig iSCSI to Equalogic SAN
Installed SLES will all patches and updates and XEN and then created OES11 SP2 virtual machines, these connect to NSS volume by iSCSI
Migrated files from traditional netware server to new hardware and stated testing and ran into very very slow files access times
A 3.5mb pdf file takes close to 10 minutes to open from local PC with Novell Client installed, same if no client and open via cifs. Opening same file off traditional NW6.5 server takes 3-4 seconds.
We have had a case open with Novell for almost 2 months but they are unable to resolve.
To test other options we installed VMWare ESXi on the internal usb flash drive and booted off that, created same OES11 VM and connected to NSS on SAN and same pdf open in seconds.
The current stack of SLES11/XEN/OES11 is not able to be put into production
Any ideas where the bottleneck might be? We think is in XEN.
Thanks

Originally Posted by idgandrewg
Waiting for support to tell me what the implications are of this finding and best way to fix
Hi,
As also mentioned in the SUSE forums, there is the option of using the Equallogic Hit Kit. One of the tools, next to the great autoconfigure options it has, is the eqltune tool.
Some of the stuff that I've found important:
-gro is known read performance killer. Switch if off on the iSCSI interfaces.
- if possible (meaning you have decent hardware), disable flowcontrol as this generally offers stability but at the cost of performance. If your hardware is decent, this form of traffic control should not be needed.
-To have multipath work correctly over iSCSI and starting SLES 11 SP1. Make sure kernel routing and arp handling are set correctly (not directly relevant if you only have 1 10 GB link):
net.ipv4.conf.[iSCSI interfaceX name].arp_ignore = 1
net.ipv4.conf.[iSCSI interfaceX name].arp_announce = 2
net.ipv4.conf.[iSCSI interfaceX name].rp_filter = 2
Test if traffic is actively routed over both iSCSI interfaces:
ping -I [iSCSI interfaceX name] [iSCSI Group IP EQL]
-Make sure network buffers etc are adequately set as recommended by Dell (set in /etc/sysctl.conf):
#NetEyes Increase network buffer sizes for iSCSI
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 8192 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.core.wmem_default = 262144
net.core.rmem_default = 262144
-Settings for the /etc/iscsi/iscsid.conf I'm using:
node.startup = automatic # <--- review and set according to environment
node.session.timeo.replacement_timeout = 60
node.conn[0].timeo.login_timeout = 15
node.conn[0].timeo.logout_timeout = 15
node.conn[0].timeo.noop_out_interval = 5
node.conn[0].timeo.noop_out_timeout = 5
node.session.err_timeo.abort_timeout = 15
node.session.err_timeo.lu_reset_timeout = 20 #Default is 30
node.session.err_timeo.tgt_reset_timeout=20 #Default is 30
node.session.initial_login_retry_max = 12 # Default is 4
node.session.cmds_max = 1024 #< --- Default is 128
node.session.queue_depth = 128 #< --- Default is 32
node.session.iscsi.InitialR2T = No
node.session.iscsi.ImmediateData = Yes
node.session.iscsi.FirstBurstLength = 262144
node.session.iscsi.MaxBurstLength = 16776192
node.conn[0].iscsi.MaxRecvDataSegmentLength = 131072 #A lower value improves latency at the cost of higher IO throughput
discovery.sendtargets.iscsi.MaxRecvDataSegmentLeng th = 32768
node.session.iscsi.FastAbort = No # < --- default is Yes
-Have Jumbo frames configured on the iSCSI interfaces & iSCSI switch.
If you are using multipathd instead of the dm-switch provided with the Equallogic Hit kit, make sure the /etc/multipath.conf holds the optimal settings for the Equallogic arrays.
Ever since Xen with SLES 11 SP1 we have been seeing strong performing virtual servers. We still use 1GB connections (two 1GB connections for each server, serving upto 180~190Mb/s).
There could be a difference with the 10GB setup, where multipath is not really needed or used (depending on the scale of your setup). One important thing is that the iSCSI switches are doing their thing correctly. But seeing you've already found better results tuning network parameters on the Xen host, seems to indicate that's ok.
Cheers,
Willem

It's very slow to access file server after installed SP1 of Win7.

I found it's become very slow to access shared files on file server after installed win7 SP1, (windows6.1-KB976932-X86.exe), access same file, the win7 without sp1 is fast in 5 secs, but the pc with sp1 need more than 30 secs. And
I tried to removed the sp1, everything goes fine, access fast as others.
I don't understand what's the reason and which feature affected it, I believe the sp1 can help Win7 be more safety, but why the performance on it get worse.
And I didn't find the same question or tips on forum or website, do you really haven't the issue?
Arnold From Shanghai, China
Arnold Yu

Hi Arnold,
Windows 7 Service pack and any other Windows Updates are released to improve the performance, reliability and security of the system.
Firstly please run the performance troubleshooter:
Open the Performance troubleshooter
http://windows.microsoft.com/en-US/windows7/Open-the-Performance-troubleshooter
If it doesn't resolve the issue, Put the computer in
Clean Boot and then check to see if the issue persists.
If it still persists, please use performance monitor to trace your computer's performance:
Performance Monitoring Getting Started Guide
http://technet.microsoft.com/en-us/library/dd744567(v=ws.10).aspx
Karen Hu
TechNet Community Support

My iphone 3g is very slow when accessing the internet is there anyway i can improve this

my iphone 3g is very slow when accessing the internet is there anyway i can improve this

What have you done thus far to try and remedy your situation? Have you taken the recommended basic troubleshooting steps outlined in the User Guide?

Macbook pro mid-2012 13" has very slow disk access

Until 3 days ago my macbook pro mid-2012 13" running OX 10.8.3 was running fine. Then, it showed very slow response anytime it had to access the hard disk. After doing the usual checks and disk first aid repairs to no avail, I booted from my external disk with an older copy of my hard disk and everything then worked as normal, except when I accessed the internal hard disk, then it crawled once again (spinning beach ball, took many seconds just to open a finder window and then several minutes to display the contents). I ran the Apple Hardware Tests and it said everything was fine, even though it tooks several minutes before the test would actually start. I also ran the program BlackMagic Speed Disk to find out if the disk was having transfer speed problems and it showed a respectible transfer rate (60MB/s), not great but not like the 0.3MB/s I was getting when I tried to back up the internal disk. I was using Carbon Copy Cloner to try to back up the internal disk but had to give up since at 0.3MB/s, it would take days to back up the 250GB on the disk. I found on the web that using "restore" in Disk Utility, I could do a disk copy without the file by file copy which allowed me to back up my disk in "only" 6 hours. Booting from my newly made copy on an external disk worked fine and ran at nearly normal speed (slightly slower since it was an external disk running through USB2). As a final attempt to prove this was a disk problem, I erased the internal disk and reinstalled OSX 10.8. I am still waiting for this install to finish, it has been 5 hours although the progress bar said it should be done in 20 minutes. This was fairly convincing evidence that it is not a software or settings problem. However, all my web searches could find no other case of a problem like mine. I presume I have a failed hard disk but as all the diagnostic programs say it is working fine, I was hesitating to bring it in without hard diagnostic evidence. If anyone knows what might be the problem, it would be much appreciated to hear from you.

It should not take 5 hours to install Mac OS X. There is something wrong with the disk. Try reformatting where you do a wipe of the drive (an select the option to write zeros which will remap bad sectors). Then try to install MAc OS X.
I got this information from here:
http://reviews.cnet.com/8301-13727_7-20064489-263.html
Back up your data.
Use Time Machine or a system cloning utility to create a full and restorable backup of your data. If you suspect bad blocks, then when cloning you might consider not using a "block-level" copy process, since this will likely run into problems.
Boot to the utilities DVD.
If you have a boot DVD for a tool like Drive Genius or another drive utility, then boot to that; if not, use your OS X installation DVD (once you select your language, open Disk Utility from the Utilities menu).
Format the drive.
Using your selected utility, format the drive and check for bad blocks. If you are using Disk Utility, click the Erase tab, click the Options button, and then select the option to write zeros to the disk (you do not need to do multipass erase options, as this will provide no additional benefit for managing bad blocks). Writing to zeros may take a couple of hours depending on the size of the drive, but when done the drive will have remapped any blocks that were not reliably read.
Restore the OS installation.
If you have used Time Machine to create your backup, boot to your OS X installation DVD (if you are not using Disk Utility) and use the option in the Utilities menu to restore from backup. Attach your Time Machine drive and then proceed with the restoration, selecting the newest backup as the one to restore to your system. If you have used a system cloning tool, then attach the cloned drive and boot off of it (hold the Option key at start-up to select it from the boot menu). When you are booted to the cloned drive, run your cloning utility to copy the installation back to the computer's main boot drive.An optional approach here is to perform a full reinstallation of the OS from your installation DVD, and then migrate your data, applications, and settings from either the clone or the Time Machine backups using Apple's Migration Assistant.

Very Slow Network access for some computers

This has me baffled, I'll try my best to explain.
We have an xserve g5 conected to xserve RAID, the xserve has gigabit ethernet.
All Client computers are also on Gigabit ethernet.
Users are all on network homes on the Server.
Most users are getting descent speeds, transfering a file from the RAID to their (network) desktop takes around 40 seconds for a 1Gb file.
However two users noticed transfer was much slower, 20 mins for the same file.
I've ruled out cable problems and hardware problems because if I transfer to the local computer harddrive the speed is up to around 1 minute.
But I've also ruled out a problem with the user account, because if the same user logs onto another mac the speeds are around 40 seconds.
I tried logging other users into the problem macs and all users drop to 20 minutes.
The only thing I can thing it could be is some problem with how those computers are binding with the server, I tried unbinding and resetting up directory access but that made no difference.
What else can I try other than re-installing?

I went ahead and did a fresh install, but this did NOT fix the problem.. I really can't think what else I can do!
Noticed in Network utility there are a lot of received errors when copying a file.
I replaced all the cables but again I don't think its can be a hardware problem because transfer rates are fine from local harddrive to server, but very slow between 2 network disks (unusually slow, considering all other computers are fast transfering the same file to the same place) HELP!

Very slow internet access..... - interesting issue !

I have 3 computers at home: PC XP, PC Vista and a new imac 24'' since 4 weeks....
As side comment I'm disappointed in Apple... I expected much more… more issues than Vista seems….
10.4.11 + Safari 3.0.4 + Firefox.
Internet on my Mac is very slow. On the same network (wireless with WEP 128) when I enter a new page on my PC and Mac at the same time it take to the Mac approx 5 time more time to display (safari or firefox)…
On safari I have empty the cash and “reset safari”…still the same….its dam slow for Internet access. I also removed the Wireless encryption but still the same….
Does somebody have a clue what it could be?

The DNS is coming from the dsl provider. Very often your router simply gets the dns automatically. With Leopard, I suspect some of the settings are such that things time out before the dns gets through. What I did was look up what the actual IP number of the dsl providers dns was. I added the IP number of the dns provider to my router. So far that seems to have solved my WiFi delays with Leopard (although that could just be a co-incidence).
Exactly how you add the IP number to a router is router dependent. Mine is a netgear, and you do it through a web page link to the router's IP number (which will be listed in the manufacturer's handbook). Generally something like 192.168.0.1
Hope that helps.

Slow file access - moving toCIFs

We are using OES11 + latest Novell client
Some file access is EXTREEMLY slow
The same Server & Workstations with NO Novell Client installed and CIFs setup is MUCH, MUCH faster
Does login Scripts work in CIFs mode ?

Hi,
What are your NSS settings on your server?
I found that I needed to set the following:
Log in as the root user, then open the /etc/opt/novell/ncpserv.conf configuration file in a text editor. Add the following at the bottom of the file:
OPLOCK_SUPPORT_LEVEL 0
Ive also added: CROSS_PROTOCOL_LOCKS 1
The above is not effective immediately - I can't remember what services I had to restart!
Please let us know how it goes.
Cheers,

All of the sudden our Mac OS X 10.7.4 operating systems are very slow to access SMB shares on our MS2008 file server

Monday all of our OS X Lion Macs can access SMB file shares on our file server and we come in Tuesday morning and now they take at least 1 minute to pull up the file share and sometimes longer. Windows PC's are immediate when connecting to the same shares. I've seen where others with different versions of OS Xhave this issue but what gets me is it happend all at once to machines that were working perfectly the day before.
I've also looked into changes on our servers and as far as I can tell there have been none.
Does anyone have any ideas? Thanks....

This solution worked for me!
I had a MobileMe account with iDisk configured on my MBP even though I never actually used it. The night they officially shutdown MobileMe the next morning I could no longer connect to my work's SMB file shares (Windows server shares). I found a work around based on some other support threads. If in the "Connect to Server" address field in Finder I specified my crendentials (i.e. smb://username:password@server/) then it worked perfectly fine. This told me it was a crendential issue. Simply deleting the saved server crendentials in KeyChain Access did not resolve the issue. No matter what I would did it would not prompt for login crendentials. Since my Mac login is different than my work domain login I was dead in the water without manually specifiying (not a permenant solution).
After finding this thread I did the following steps and it resolved the issue 100%.
1. Open Terminal
2. cd ~/Library/Preferences
3. ls .GlobalPreferences.plist to verify file exists in that directory
4. rm .GlobalPreferences.plist to delete file
5. ls .GlobalPreferences.plist to verify file no longer exists
4. Go to Force quit to relaunch Finder
5. Lauch "Connect to Server" within Finder and all was good, server connects perfectly
Thank you very much DavidRSewell!!!!

Time Capsule (A1409): slow file access problem and how do we create a back up of the files on timecapsule?

Time Capsule: We have a model no A1049 our network (installed by someone no longer working with us, so I don't know how it was set up or how to access any settings other than via Airport Utility)
We use it for our central file storage, and as a disk for timemachine backups from the several macs we use here.
The time capsule is running but we have slow access to files, it takes ages to bring up the list of files available, can I fix this?
I have just updated the firmware.
I would also like to know how I can back up these files to another disk.
I have searched the manuals and also the support community but I can't find the answers or any instructions other than the manuals and would appreciate help.
Thank you

The Time Capsule was designed to handle Time Machine backups from one or more Mac computers, and it will work reasonably well for that purpose.
But.....and this is a big BUT......it will not work very well at all if you try to make it act as a file server, since the disk spin up time is quite slow among other things like slow read times from the disk.
Suggest that you get with an IT specialist who can recommend the right file server solution for your network based on your needs.
As far as backing up the data on the Time Capsule, the simplest way to do this is connect a USB drive to the USB port on the Time Capsule and use the built in Archive function in AirPort Utility to make a complete copy of all of the data on the Time Capsule.
Unfortunately, the simplest way is also the slowest and the Time Capsule will not be available for Time Machine backups or file serving during the Archive procedure, which will likely take 4-6 hours or so depending on how much data might be on the Time Capsule. A good time to do this might be late at night, so the Archive copying will run overnight.
Another better option would be to use a commercially available application, like Carbon Copy Cloner to automatically back up the Time Capsule disk each day at a time that you choose. The advantage to doing it this way is that CCC will only back up the changes that have occurred since the last back up, so once the first "master" backup is done, the subsequent "incremental" backups will only take a few minutes each day.
Your IT specialist / consultant will likely have other suggestions for you as well. The advice that we have offered here is meant to be general in nature and not specific to your particular needs.

Slow file access-Elements 12: I store all my photo files (".nef" RAW files) in a RAID 1 external hard drive, which the Elements Organizer links to the reference thumbnails. Over some time - say, the past year, and especially recently, the time to bring

One further bit of information: I did recently run a "disc scan", in case there were file system errors, then ran defragmentation -- on the external drive. This did not solve the problem.

I think I'll deal with your different questions in several posts, it'll be easier for me.
josephunit2n a écrit:
A few comments: recently, for the first time, I did a full "backup catalog" routine (with external RAID storage connected) to a second external usb drive, which ran successfully (done, at the time, over longstanding concern that even the RAID 1 storage was not enough data security - as you have mentioned).
Good thing, and it's not really a surprise for me, I would have expected no slow down in a process which only reads your RAID drive data.
One big concern: in all transactions (backup catalog; move to external storage) I always ignore the "reconnect missing files" dialogue. This is due to past experience. Long ago, when I ran it routinely, it was a disaster. At first, I thought I might reconnect a few randomly missing files. While this was so long ago I cannot recall all details, everything went to hell. Even after manually locating a "missing" file, the "reconnect" never worked. The number of "missing" files skyrocketed, far out of any realistic number. Even with Adobe phone support (which is critical for such an application - and must be made available again, I have no problem paying for it), the catalog was hopelessly corrupt, and I manually built a new catalog, file-by-file. Adobe advice then: NEVER USE "RECONNECT MISSING FILES", which I have followed religiously (while also trying to be meticulous in my transactions, not to ever create any "missing" files).
I have never read Adobe advising to never reconnect missing files. Maybe it's not the best course in all circumstances, but I don't see a possible problem there. What is recommended by Adobe is to always reconnect files before doing a backup... Now, my own experience is that if you don't reconnect before a backup you get a restoration where the catalog still points to missing files and where those missing files have not been backed up, totally logical. I would not consider this question as a BIG concern.
. Finally, "just for fun", moments ago I connected the RAID storage drive, opened the organizer, and randomly opened a few images in "full screen" view - then opened a scattered group of 4 or 5 images -- and, they all came up promptly!!!!! So, this "slow access" problem isn't consistent, all the time. Also, I must comment, your advice to avoid the RAID 1 external usb drive, for future catalog storage, seems "tech superstition", which I will not harshly criticize, as I also have my own technology irrational superstitions. I believe the computer "sees" this drive no differently than any other external, usb, drive.
There's a difference between 'technology irrational superstition' and 'reasonable doubt due to ignorance' ... Understanding the problems which may arise when using a RAID drive array supposes understanding of:
- how the organizer catalog recognizes any drive in its database. That's ok for me, but I have no personal experience of such systems. What I can tell you is that most of the problems I have seen with RAID systems were of that kind.
- How efficiently the organizer deals with the OS when using a catalog stored on the main drive, with adequate RAM and scratch disk space while the files themselves are on the external RAID drive. Some organizing tasks imply writing to the files themselves. The xmp sidecar files (very small) are stored together with their raw parent. The thumbnails are stored in a database in the catalog folder...
- How the organizer works with the OS (the APIs) and the particular disk driver. (I am totally ignorant, but I have seen similar problems for other Adobe applications in the feedback forum).
... As I said, I have to leave for a moment...
To be continued!

Slow file access

I have a class that just does some trace logging and it is extremely slow
          when used with a servlet, but is very fast when used otherwise. The class
          is basically just the following:
          Date date = new Date();
          SimpleDateFormat formatter = new SimpleDateFormat ("MM/dd/yyyy HH:mm:ss");
          DataOutputStream dos = new DataOutputStream( new
          ileOutputStream( logFileName, true ) );
          dos.writeBytes( formatter.format(date)+" "+logIdStr+" "+msg+"\r\n" );
          dos.close();
          I added a flag that would skip around all the logic in the write method of
          this class so I could time the servlet without it and found it takes 10
          seconds longer to run the servlet with this logic being run to create a
          couple thousand traces. Any idea why it would be so slow?


May be this is because the DataOutputStream class is intended to write
          java primitive types in a binary portable format, so it could make CPU
          intensive checking and conversion ?
          For textual output, it should be better to use PrintWriter.
          Can you check CPU usage ? You can download OptimizeIt! and profile your
          code.
          Note also you open and close a file. How is your disk's fragmentation ?
          Finally it is more efficient to use a StringBuffer to produce the output
          string before passing to a method.
          David Thompson wrote:
          >
          > I have a class that just does some trace logging and it is extremely slow
          > when used with a servlet, but is very fast when used otherwise. The class
          > is basically just the following:
          > Date date = new Date();
          > SimpleDateFormat formatter = new SimpleDateFormat ("MM/dd/yyyy HH:mm:ss");
          > DataOutputStream dos = new DataOutputStream( new
          > ileOutputStream( logFileName, true ) );
          > dos.writeBytes( formatter.format(date)+" "+logIdStr+" "+msg+"\r\n" );
          > dos.close();
          > I added a flag that would skip around all the logic in the write method of
          > this class so I could time the servlet without it and found it takes 10
          > seconds longer to run the servlet with this logic being run to create a
          > couple thousand traces. Any idea why it would be so slow?

Very slow file download speeds

Whenever my computer is trying to load movies or download files, the speed at which they download is extremely slow.
On a file I'm currently downloading, the average speed is around 120 kB/s, and I'm lucky if I can get it up to 20. Also, movies, like in YouTube, take at least ten minutes to download, even if the movie is only a few minutes long.
Obviously, this is very frustrating, especially because I haven't always had this problem.
My surfing speed is fine, it's a bit slow but I'm not complaining, I just hope someone has a solution to this slow downloading problem?

I was going to agree and say, yeah let's blame it on Vuze or the file, but that doesn't explain why the YouTube videos, along with any videos on any other site, download so slow.
How would I go about restarting the modem (I have 2Wire at my house)? And is there a chance that would help? I wasn't sure because of the fact that my other computers are fine, but it's worth a shot.

Very Slow POP3 access in Mac Mail

Hello All,
I have found that downloading email via POP3 is extremely slow compared with IMAP for MAC Mail.
I received my new imac a few days ago and have being trying to setup my mail account with Mac Mail (I've updated the system software to the latest).
When I tried the Mac mail application with my Gmail account via POP3; it was extremely slow to download emails (10 to 20 seconds for each email to download). Plus when I sent an email to myself, checked that I had received it in the gmail web interface, and then did a 'get mail' in Mac Mail, the email didn't appear!
So I switched to IMAP and found that it downloaded much quicker (several emails a second) and I can send/receive emails with no delays.
While this problem is solved for me, my wife uses yahoo mail, which doesn't support IMAP!
Has anyone found this problem with their pop3 email accounts? I've also found that the pop3 seems to download multiple copies of the same emails.
As you can imagine: this is so frustrating, email is such a basic feature that I would have expected it to work straight out of the box. Anyway, so much for buying a new mac and expecting a smooth experience (unlike the problems I was having with windows)
Does anyone know how to fix this??
Cheers,
Don
P.S. Apologies for the rant! Besides this email issue, I am very impressed with Mac OS X

Try resetting some of the hardware involved (PRAM~NVRAM). See this Apple KB for details, etc.:
http://support.apple.com/kb/HT1379
Can't hurt to try, and apparently this has helped others recently.

Very Slow Disk Access

Recently I've had to restart my PB multiple times in order for it to start up because it just sits with the Apple logo and the circle going. I booted from a backup drive, no problem, but when I attempted to reformat the drive via Disk Utilities, it would not allow it. DU went into 'not responding' mode. Now when I boot, it takes forever and there is a tremendous lag time. How do I determine if there is an actual hardware error with the drive or if Disk Warrior would be able to correct the problem (I would have to buy DW)?

You may have a cache overload.
Make sure your reset Safari if that is your bowser all the time and empty the caches on it and also on any third party software.
I empty my caches all the time on Safari, yet it still shows up I need to clean it using my NetBarrierX4. You may also empty temporary files.
And I have resorted to taking my battery out to reset my logic board when I can't fix things.
Adware and Malware and spyware and trojans can cause this also.
I reset Safari everyday. Go to Safari preferences or any brower you use and reset to empty caches....and then go to system preferences and click on security and delete any cookies. Cookie cleaning is very important...at least for me.
Let me know if any of these things work.
Worms can also cause it.

Very slow file-access - Opinions?

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