WRT54GS keeps slowing down

I have a WRT54GS connected to 2 Ethernet-wired PCs and 2 powerline-connected PCs. Most of the time, it is just used by an Ethernet-wired PC sitting next to it. I subscribe to Yahoo SBCGlobal DSL (now owned by AT&T) with a SpeedStream 5100 DSL modem.
Every few hours hours, the connection speed slows drastically, sometimes to well below dial-up speed (SBCGlobal has a site where you can test your connection rate). It does not speed up by itself. By setting up the router again, powering down and up the router, modem, and the computer -- I have not yet figured out yet exactly what fixes the problem -- eventually I can get the connection back up to DSL speed.
I believe the problem is specific to the router, because I never have a speed problem when the DSL modem is directly hooked up to the PC next to it.
I have verified that I have the latest version of router firmware, and I have used Linksys's EasyConnection diagnostics, which says everything is ok. I have read through the Linksys online docs and the messages on this forum, but I have not figured out the problem yet.
Any help would be greatly appreciated. Please keep in mind that this is problem with a wired, not a wireless, PC connection. Thanks in advance.

Hi… I think you should try reducing the MTU on the router to 1400 or 1300. If you still face the same problem, upgrade the firmware of the router.

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Internet speeds keep slowing down to a crawl

I'm having a problem that has only developed in the past week which was during a time when I haven't changed any configurations in that period of time since my son was born a week ago yesterday and I obviously had more important things to do than mess with my network configurations. However, about 2 weeks prior to his birth, in the process of configuring a baby monitoring system with icam source, 3 weeks or so ago, I read that I might be able to improve my internet performance, I ran googles namebench a couple of times and added and re-ordered the DNS servers that had been listed prior to any problems developing based on its' reports. My internet speeds improved as a result of changing those DNS settings and stayed good until the past week. But of course, we now need to use the computer as part of our baby monitoring system and it's not working worth a **** and I'm getting frustrated since I can't put my finger on the problem and I don't really have time to spin around in circles right now. I'm sure it's probably something simple and I can't put my finger on it though. Sleep deprivation is new to me.......
I've kept running log of notes so this is a little deshoveled but I figured the more information I provide the better the chance someone might help me get this solved quickly.
In the last week, since my sons birth, my internet speeds would be okay after restarts and resetting everything, 2.5 Mbps or so but after a 10-15 minutes it starts to slow down to .2-.3 Mbps. I went thru all my network settings, restarted everything, repaired permissions, I've changed ethernet cables reset PRAM, firewall is running, stealth mode enabled, allow signed software incoming connections and my various other programs such as netsessionmac4f3c6b, skype, java, itunes, etc.
All sharing services off and pretty basic login items at startup including growl.
I had AT&T come out and check my DSL line and everything checked out on their end up to and out of the DSL modem based in their equipment tests.
The problem seems to start when I connect my imac (a fairly loaded 27" imac I got in Dec.) First off, as soon as the imac is connected to the modem via ethernet, the old ethernet modem flashes and continues to flash, even right after startup. So the tech thought something was running in the background and I can't figure out what. I looked through login items but don't see anything that would be a problem and am afraid to eliminate everything.
So I created a guest account to eliminate any login items (I think) and in I got 5.69 Mbps right off the bat. But after a minute or two, without changing anything my download speed slows down and I get for example .77 Mbps. The same thing happens with my administrator account on the imac. Fast speeds at startup and more importantly if I change the configuration by switching between ethernet and airport, I get fast speeds right after changing the configuration but after a minute or two I am well below 1.0 Mbps. I've got several network configurations with automatic, airport and ethernet set up in different ways including a clean ethernet connection with the original DNS settings.
I haven't set up an airport only account but that really isn't the way I want to hook up the computer that sits right next to the modem and runs my network. Restarting the old modem and direct connecting the computer to the modem results in the same thing happening.
I connected my ethernet from the (old?) modem directly to my ancient powerbook G4 and I got +5.6 Mbps download but it also slowed down to 300 kbps after 5 minutes or so the first time (old modem?)
Now to explain why I have "old?" listed above. I was then able to get a new DSL modem from AT&T, hook it up just fine, get enormously faster internet service in the 5,000 kbps only to have it slow back down to around 300 kpbs after connected for several minutes.
directly connected to imac-bypassing router
3,500 kbps
after 15 minutes-250 kbps
connected to imac thru router/time capsule with airport extreme
2500 kbps
after 15 minutes=166 kbps
directly connected to an older powerbook G4 with new modem
IP address of 192.168.1.64
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after 15 minutes=5.67 Mbps
after 30 minutes= 5.59 Mbps
1 hour-5.66 Mbps
Very solid, stable readings for what I am used to. This would seem to isolate the problem to the imac.
directly connected to imac with new modem
IP address of 192.168.1.64
5.8 Mbps on speedtest
after 30 minutes= .60 Mbps-ping takes 250 ms
1 hour= .46 Mbps-ping takes 250 ms
Now a problem that only started last night after I hooked up the new modem and started up my old Time capsule/airport configuration, I got a message that said something to effect of "another device on this network is using computer IP address 192.168.1.64. So I tried manually changing last digit of the IP address on the computer to one number higher and it kept saying the start and end range were incorrect so I shut the airport station down since when it was connected, it would not allow the computer to connect thru the router via ethernet. I did a hard reset on the airport and I got it back up and running just fine but the internet speeds on the imacs' ethernet connections are so slow it's practically worthless. I also checked to see what was connected to my airport on any given occasion, 2 iphones, 2 pads, another imac running upstairs and a newer powerbook running icam source that is supposed to be the baby monitor. Except for the laptop everything can use "802.11n" but the powerbook only connects via 802.11g so I have set the airport to that limiting setting.
Any suggestions? Is there a way for me to log what is happening so I can report in more detail?

First thing is to check if the wireless is on a sensible channel: HomeHub doesn't always make sensible choices. Install inSSIDer on your laptop and see what other devices there are around and if there is any clash. Also, try moving the HomeHub around a little, even quite small differences can make a big difference to wireless signals.
You could run an ethernet cable from downstairs to upstairs. Easy to do, but can be a bit unsightly. If most of your devices are upstairs, you could use this cable to connect the modem to the HomeHub. If you have devices both up and down, you may want to keep the HomeHub downstairs and add a switch upstairs.
HomePlug may be suitable for you. If you search Amazon for HomePlug you will see a couple of kits for just over £30. Don't go for an 85Mbps one. A 200Mbps such as the TP-link or D-Link should be much better than wireless, but not as good as a cable.
Depending excatly how many devices you want to connect and where, you can pay more and have a builtin wireless at one end: http://www.amazon.co.uk/Devolo-1408-Wireless-N-HomePlug-Adapter/dp/B00472MMCQ/ref=sr_1_15?ie=UTF8&qi... Or it may be best for you to use the basic devices and add an old wireless router in switch mode.

Why does Photoshop keep slowing down?

I've been using Adobe Photoshop CS5.1 for two years now, and for some reason it seems to have the problem of slowing down after using it for a while, so if I'm working on a project I have to keep closing it and reopening it to get it fast again. It's weird because it doesn't seem to matter how much stuff is on the canvas, it's just how much I've drawn and hit undo and erased or did anything, After like 5 minutes of straight work it just gets too slow for me to work in, like when I switch tools or change the color it takes a couple seconds to respond. So literally every couple minutes I have to restart Photoshop and open the same file.
What's really odd is that sometimes Photoshop will work perfectly fine and stay lightning fast for hours. Like, for the last couple of months it's been 100% fine, but since a few days ago it started to have this "slowing down" issue again. Every couple months it seems to decide to be perfectly fine or just really annoying. I didn't change anything in my computer.
It can't be my computers specs or my settings in Photoshop, but I will tell you all of that anyway.
OS - Windows 7 64-bit
CPU - Intel Core 2 Quad Q6600 @ 3.0GHz
RAM - 12GB DDR3 @ 1333MHz

There is no malware scanner running, in fact I have tried closing out all other applications and unnecessary processes to help improve performance. No luck.
Also, my post actually wasn't quite finished, but my internet shut off on me last night and I guess that just automatically posted whatever I had done before then. What's even better is that the forums won't allow me to edit it. What great features!
Anyway, here's the FULL spec sheet of my computer...
OS - Windows 7 64-bit
CPU - Intel Core 2 Quad Q6600 @ 3.0GHz
RAM - 12GB DDR3 @ 1333MHz
GPU - NVIDIA GeForce GTS 450 1GB
Storage - 1x 128GB SSD (OS installed on), 1x 750GB HDD, 1x 160GB HDD
I have the 64-bit version of Photoshop CS5.1 Extended, installed on the SSD. Here's the settings I have in the preferences:
Memory Usage - 100%
Scratch Disks - All 3, SSD 1st, 750GB HDD 2nd, 160GB HDD 3rd
History States - 100
Cache Levels - 8
Cache Tile Size - 1028K
I have fiddled with these settings and restarted Photoshop countless times. In the end it's the same exact result: Photoshop slows down after a few minutes of work and I have to restart it. I have about 50GB free on the SSD, 150GB free on the 750GB, and about 140GB free on the 160GB.
I don't understand why it gets so slow even when my RAM usage only makes it up to about 45%. Why doesn't it just utilize ALL of the memory like I told it to?
I've tried setting cache to 1, 2, and 4, same result. Cache tile size to all the different settings, same result. History states to an extremely low level like 10, same result. I just don't understand why Photoshop is doing this, especially because it decides to speed up on its own every couple of months...

Macbook keeps slowing down and crashing

Hi,
I started having this problem about 2 weeks ago. Everything was working fine, then out of nowhere, my macbook froze. I waited for about 10 minutes, then I turned it off. When I turned the computer back on, it was EXTREMELY slow. It took 15 minutes just to boot, and after that, even when i just moved the cursor, the rainbow wheel would appear and keep spining for 20 minutes. It was impossible to do anything. So I decided to restore the hard drive from a backup I had. After I did that, it worked fine for a couple hours, then the same thing happened. Then I did some research and concluded that my hard drive was dying, so I got a new one, restored it from my backup and replaced my old hard drive. But after a few hours same thing happened again.
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How much free space on the drive?
Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. Make sure you always have a minimum of 15% free disk space.
I have more than 50% free disk space. I did have some slowing down problems before because of disk space, but this time it's different. It's not a regular kind of slowin down, it slows down so much that it becomes imposible to do anything. Even when I just move the cursor, rainbow wheel appears and doesn't go away for 10 minutes.
But thank you anyway.

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Remove all references to the site in your Reading List and in Top Sites.

Why does my iPad 3 keep slowing down?

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Close All Open Apps... Perform a Reset... Try again...
Reset ( No Data will be Lost )
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http://support.apple.com/kb/ht1430

MBP keeps slowing down after some uptime

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I bought my MBP less than a month ago, and after about two days of uptime it starts to slow down dramatically. Apps become unresponsive and/or respond too slowly and performance as a whole is very bad.
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Linksys E3000 keeps slowing down to snail speeds

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SuperDuper! http://www.shirt-pocket.com/
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It would greatly help that the router’s needs a firmware upgrade and a reset since you are experiencing intermittent connection. By the way, were you experiencing this problem on both wireless computers or only on the win 7 laptop? If the problem is only with the win 7 laptop, then you might need to update the drivers of the win 7 laptop wireless adapter. If in case that the problem is with both computers then you need to optimize the wireless performance of the router. You can use this tool: : http://www.metageek.net/products/inssider/ to select the best channel that you can use on your router and then check if the router’s wireless performance will improve.

TS3048 My apple magic mouse keeps slowing down.

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Hello:
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Barry

WRT54GS keeps slowing down

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