Apps effects on speed and reliability

Hi guys!
I've recently purchased an used MacBook Pro (it's "born" in April 2009) with Snow Leopard.
I've always used Windows and I know that many programs will slow down the computer and might cause some problems in terms of stability and reliability.
I want to use my Mac for music, recording and on a live stage, so I need MAXIMUM speed and reliability, I don't want a kernel panic to show up right in the middle of a song!!
Moreover, I was told from my trusted "technician" to keep just the necessary apps and nothing more!
Besides the built-in apps, I only have Logic Pro and Mainstage for music and Virtualbox for the rest, with Windows 7 and all the programs like Office, Skype, Dropbox and so on..
What I wanted to ask is: How do apps effect a Mac?
I know there is no registry like in Windows, and the apps are just "folders" I can delete when I want, but I really don't know really much about this and I don't want to mess up my laptop!!
Thanks for your help!!
=Luca=

Nonono I must have been misunderstood!
The machine runs flawlessly, it has 8 gigs of RAM and it can run a VM while running Logic or Mainstage without noticing any slowing up!
I'm not worrying about the speed of the apps I might want to use, but about how they will affect the stability and reliability of my Mac, for I have to use it in live situations.

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Speed and Reliability

Hello
Been with BT for about 2 weeks now
told i was going to get around 10 mb on my line
I am still stuck on an IP profile of 5 meg
I got more on AOL
My line stats are as follows:
ADSL line status<script type="text/javascript">// var trClass = ["odd", "even"]; var td1 = ["w3", "Line state", "Connection time", "Downstream", "Upstream"]; var td3 = ["w3", "VPI/VCI", "Type", "Modulation", "Latency type", "Noise margin (Down/Up)", "Line attenuation (Down/Up)", "Output power (Down/Up)"]; var td2 = ["", "Connected", "0 days, 0:06:15", "6,112 Kbps", "448 Kbps"]; var td4 = ["", "0/38", "PPPoA", "ITU-T G.992.1", "Interleaved", "9.2 dB / 25.0 dB", "38.0 dB / 22.0 dB", "19.8 dBm / 12.4 dBm"]; // </script>
Connection information<script type="text/javascript">// createTable("normal", trClass, td1, td2); // </script>
Line state
Connected
Connection time
0 days, 0:06:15
Downstream
6,112 Kbps
Upstream
448 Kbps
ADSL settings<script type="text/javascript">// createTable("normal", trClass, td3, td4); // </script>
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.1
Latency type
Interleaved
Noise margin (Down/Up)
9.2 dB / 25.0 dB
Line attenuation (Down/Up)
38.0 dB / 22.0 dB
Output power (Down/Up)
19.8 dBm / 12.4 dBm
Any help would be appreciated please? and is it possible to be switched to an ADSL2+ standard...

Hi there
With a line attenuation of 38db downstream, the maximum IP profile for a good line is 6000kbps on adaptive 2-8 megs. broadband.
And as Nano said, thus the main reason for asking.....
You could improve slightly on your present line condition, although your stats are typical, and show no obvious fault, apart from a touch of line noise, all normal.

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If you want that your wife gets her own iCloud account for Mail, Contacts, Calendars, etc. but gets also access to your media then you have two set up two things on her device:
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and
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You can update directly to Yosemite (for free) through the App Store (this is 10.10). Make sure your existing applications will run on this OS.
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Do the below and keep your boot drive below 50% filled and not more that 80%, that's about all you can do without a full reinstall of the OS.
12: OnyX cache cleaning
Category: OS X, application and User account software related
Description: Gives OS X, application and user account caches a enema, lets then rebuild again new, resolves strange and unknown issues based on cache files being corrupted .
Only cache files are removed, not users data, files, programs or OS X. Some settings will be set back to normal in Finder and other locations. Spotlight will rebuild a new database.
Problems possibly resolved: Varied: Flash install issues, Dock/Finder/File issues, "ghost files", performance and privacy related
Instructions:
Apple doesn't supply a easy method for the user to self clean the caches, thus we have to turn to third party software.
Use the free OnyX matching your OS X version and run all the initial checks, stop if any give a warning, you have a bigger problem. See #4
Run though all the Maintenance and Cleaning aspects (except don't delete the log files) and reboot at the end (must)
You must be through running all the maintenance and cleaning aspects as this is a "catch all" method and any number of corrupted caches may be responsible for your issues. You need to REBOOT at the end of using OnyX. Canceling the in-between reboot requests is fine.
Read Step #13 and perform the Verify > Preferences before rebooting at the end of using OnyX.
Get the free OnyX here: http://www.macupdate.com/app/mac/11582/onyx More info: https://en.wikipedia.org/wiki/OnyX
Just a few of OnyX many successes:
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https://discussions.apple.com/message/18579487?ac_cid=sa123456#18579487

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Hi John
iTunes Support wasn't of any use to me.
I have also been having another problem - with BBC iPlayer and other video streaming not working due to insufficient bandwidth, despite my overall download speed being consistently around 50Gb. This is also affecting AppleTV downloads
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Questions and answers on DLM, sync speed and real ...

I was confused about some DML details and posted on a BE forum (https://avatar.bethere.co.uk/forum/viewtopic.php?t=43542) and got what was to me an incredibly helpful response from Tom (drsox). I thought it would be of interest to some readers here so copy it below. Once again, many thanks Tom.
1) FTTC DLM applies only between the cabinet and the modem?
>> Yes, as there isn't any broadband / data signal going anywhere further down the line to the exchange if you are on FTTC!
2) What are the different parameters that apply on this hop? I know there is a current sync speed, a current snr, a target snr and an ip profile. Anything else?
>> The IP profile isn't really related to DLM, it just "follows" your sync rate. In the past the IP profile would take up to 3 days to "follow upwards", leaving you with a high sync and awful speeds! This has been changed now on 21cn and "RE-ppp"ing (rebooting the router) would force the IP Profile to update instantly.
DLM changes the SNR target. So where BE have hard coded / set SNR targets such as 3db, 6db, 9db, 12db etc.. They only change upon user request. BT use their DLM system where line instability or line error counts are collected and analysed, the SNR target and interleaving settings are then modified in increments to try and stabilise the line.
This image shows quite well how, over a 6 day period, BTs DLM noticed that my line fault was fixed. I didn't get the full speed back for a week.
3) Is the ip profile the same as the BRAS profile?
>>Yes
4) The DLM keeps statistics of errors etc to dynamically change the ip profile?
>> Changes the SNR target and interleaving for the line which will reduce the speed, and therefor the IP profile.
5) There is a general theory that the DLM is incapable of telling the difference between an error and a modem power cycle, so that power cycling can cause your profile to lower. Is that correct?
>> Yes, if you resync / power cycle your router multiple times in a day it is likely to try and "combat the line errors" and reduce your sync rate by increasing the SNR and / or interleaving on the line.
6) Can other connections and disconnections have the same effect? For example, if I reboot the router (where this is separate from the modem)? Or use the router interface to disconnect/reconnect the broadband?
>> PPP drops (router reboots while leaving the BT Openreach VDSL modem on and connected) won't affect DLM. The IP profile will match your sync rate upon reconnection of the PPP session.
7) If you have a low ip profile, does this mean that the sync is limited to the ip profile?
>> Other way around, if you have a low sync rate then the IP profile will match the sync rate. If you get an awful sync rate and the IP profile follows downwards, then you resync higher but the router "keeps the PPP session open" (which is possible if you resync quick enough) then your IP profile will stay low, even though the sync is high. Until you reboot your router or disconnect and reconnect the PPP session.
8) Can the sync rate change dynamically without a reconnection? If the ip profile gradually rises, will the cabinet force a resync to make sure the customer is actually getting the benefit of the higher ip profile, or must the user intervene with a modem resync?
>> See above - Sync can rise without affecting the IP Profile and the cabinet does not force a RE-PPP.
8) As I understand it, if the ip profile gets stupidly low for some reason, it can only be reset by BT wholesale? This will only be done after a visit to your home and a telephone call from the engineer to the BT wholesale central admin?
>> Mixed reports plus I don't think people understand the difference between sync speeds, line faults, the delay in DLM increasing sync after a fault.. I expect half the reports on the BT forum are not related to a stuck BRAS / IP profile. It is possible for the ISP or a BT engineer to reset the IP profile and possibly DLM training.
9) (8) This applies to all ISPs using BT Wholesale: some may be more willing to force this process to happen on behalf of their customers, but none can cirumvent it?
>> GEA providers (I believe) still have DLM but don't have BRAS / IP profiles unless they implement their own.
10) Who sets the snr? As I understand it, the customer has no direct control. Is this different for different ISPs?
>> Mixed information again, I believe that BT Wholesale give providers DLM override controls and SNR settings but none? (or few) ISPs use this system.
11) Real download/upload speeds are physically limited by the sync rate. They are also naturally limited by local limitations (such as wireless connections), server limitations, and congestion at various points along the route? Any more? The congestion along the route will vary bewteen ISPs as they use different routes with different capabilitues.
>> It is possible for BTs regional or local cabinet network to become congested. Supposedly the minimum speed you should achieve over the BT part of the network is 15mbps. ISPs such as Plusnet, BT etc.. then layer their own "discriminatory" traffic management on top of that (ie, slow down torrents etc.).
12) Real speeds are 'unnaturally' limited by throttling. This will also vary from ISP to ISP. Sky claims to have none, and BT none except for p2p. PlusNet and John Lewis have significant (but well explained)throttling. All the more expensive operators have none.
>> What you said
13) The ip profile affects the sync rate, and therefore actual speeds. Does the ip profile effect actual speeds in any other way?
>> Not quite right. The IP profile directly affects the speeds you can achieve but the sync rate affects the IP profile. The sync rate is determined by the stability and quality of your line and what DLM thinks it can cope with.
14) Many people (including AndrueC above) report real speeds from speedtests that are consistent and not close to the ip profile. These can't be explained by congestion (that would make them inconsistent). They can't be explained by server limitations, as they are consistent accross servers and the same servers give better speeds to other people. They can't be explained by local limitations, too many people claim sudden drops where the local conditions have not changed. They should not be able to be explained by throttling, as they as seen for many ISPs who do not throttle (I don't hold with the ISP lying theory here). What other factors are there that can explain these cases?
>> AndrueC and some other Sky customers have strange symptoms where speeds are around 20mbps rather than the full sync speed. The only logical explanation is either local cabinet congestion, contention between BT and the provider's network (not enough investment by the provider) or artificial traffic management on the providers side. It is also possible that the router that the customer has attached to their line is unsuitable for the higher speeds. For example an old ethernet router may only be able to cope with 20 or 30mbps! A friend of mine has a TP-Link ethernet router running Tomato on a BT 80mbps service but the TP-Link's CPU limitation causes his service to only perform at around 68mbps; he has a replacement router on order. (Obviously wifi will significantly reduce performance).
15) If you get a stupidly low ip profile, how long can you except it to take before it climbs to something more reasonable? (eg in my particular case, my profile is currently around 15Mb, and from BT service line tests should be around 58Mb). And the classic question, is it best to power cycle the modem (1) never, (2) occasionally (how often) or (3) never if at all possible? Mine did jump from 3.5Mb to 15Mb on one power cycle. Was that just coincidence?
>> My FTTC line took about 6 to 7 days to go from 40mbps to 80mbps after a line fault. It is possible that your 3.5mbps to 15mbps increase was the "re-ppp" affecting the BRAS profile and that your sync had slowly been increasing over time.

what a waste of money sending an engineer to "fix a fault" which does not exist. Precisely.
In my original BE post to which Tom so helpfully responded, I began: It seems to me that DLM is an excellent concept with a highly flawed implementation, both technically and administratively. I think that sending out an engineer to fix an obviously flawed profile is the main example of an adminastrative flaw. I understand (I can't remember source, maybe Tom again) that they are sometimes relaxing the requirement for a visit before reset.
Maybe the DLM system is too keen on stability vs speed. This will keep complaints down from many people: most users won't notice speed too much as long as it is reasonable, but will be upset if their Skype calls and browsing are being interrupted too often.
However, it does lead to complaints from people who notice the drops after an incidence (as in your thread that has drawn lots of interest), or who only get 50 instead of 60. The main technical flaw is that DLM can so easily be confused by drops from loss of power, too much modem recycling, etc, and then takes so long to recover.

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Disclaimer:
Do this at your own risk, since Lenovo does not officially support it.
Turn on active cooling, if you do CPU intensive stuff for any prolonged period of time. This will take away some on battery time, but if battery time is of ultimate concern to you, then this change is probably not for you to begin with.
If you go through prolonged periods of CPU intensive activity, you will lower your battery life and produce a lot of battery heat, because you will have a relatively high discharge rate. A high discharge rate reduces both the number of charge cycles and the maximum charge capacity of a Li-Ion battery. I don't know how safe all of this is, so do this at your own risk and probably monitor temperatures along the way. Other laptops can do Turbo and full speed on battery power (e.g., the slim 3 lb Sony Z, with the i7-2620M), but then other laptops have different designs and cooling systems, so who knows how the Lenovo W520 hardware will react to this.

Hi,
I have the opposite problem - my i7-2720QM is fixed at 2.2GHz no matter how hard I spank 1, 2 or all cores, and no matter what System Performance settings I apply. It even runs at this speed, and gives the same bench marks when on battery with the "system performance" set to Low.
No one even knows what the various System Performance settings actuall mean. E.g. Neither Lenvo support nor these forums could tell me what the difference between "Maximum Turbo","Turbo" or even "Low" under "System Performance" in the Lenovo power manager Advanced settings.
I have been trying go get turbo boost to work for 2 months. I have wasted so much time with this machine, I could have bought 2 Macbook pros for the cost of the time lost.
I dont know why Lenovo have disabled the turbo boost (and the opposite, turbo drop?) feature for this CPU - is it deliberate, or incompetence? Its certainly false marketing and extremely annoying that I have to use my ancient PC to do single threaded type work which I know the Laptop can manage if it were not crippled.
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after typing ./asadmin start-domain --user admin domain1. Instead of it to give me the password prompt, it threw the following exception:
INFO: SEC5046: Audit: Authentication refused for [admin]
Login Failed javax.security. auth.login.LoginException: Failed file for login admin
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I always login to the O/S as root.
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Thanks very much kedar.mhaswade for your suggestions.
I do not have a regular access to the Internet, I
would have gotten back earlier than this, so i'm
sorry. Anyway, i checked the content of
~/.asadminprefs and the password is not the same with
the one i'm using. I found the default password
supplied by Sun but I don't think this could be the
problem. I'm actually using the App server that is
bundled with Sun Portal 6 and 7 and so i supplied my
own password during installation and i've logged in
several times after installation. It just failed in
one of those logins and had stopped working since. I
always encountered the same problem either when using
Sun Portal 7 or 6 on Red Hat ES 3 and Suse 9
respectively.
I'm posting the content of admin-keyfile as you
requested:
admin;{SSHA}Qf/m4KEBDPojsP1mkjywE5XZA6SPh7i8WQmV/A==;a
sadmin
# Domain User and Password - Do Not Delete Entry
Above
So i will so much appreciate your help and i wouldn't
mind if you could send me your phone number. Thanks.Hi tolulike,
Even if you supplied your own password, we have this developer friendly
feature that has side effects that are at times hard to diagnose. Can you
please
- rename the .asadminprefs file and make sure that there is no .asadminprefs file in your home directory?
- attempt to start the domain.
You should be prompted for the password.
The idea is that when you've got that file and that entry AS_ADMIN_PASSWORD in your home directory, asadmin will read it
from there and you land in this (unfortunate) situation.
Obviously doing this might have some side effects with other domains. This
is because for all domains, asadmin reads this file as a last resort. So,
it might so happen that this file is actually required for functioning of your
other domains.
But now you know when this file is used, so there is no mystery (hopefully).
Let me know if this works.
Thank you.
Kedar

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Apps effects on speed and reliability

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