Performance problems even at the login screen

[EligibleJam]

Hi:

I posted this question to the Server forum, but I should have posted here, since this is probably a client problem.  Here is my problem in a nutshell:

• At times (at least once daily), when I'm inworld, I experience incredibly slow chat lags.  People around me have no lag problems at all, but I'm the one who can't  type anything.  
• While this is going on, my FPS are perfectly fine (~30-35), no packet loss, and the ping time is under 100ms.
• The most intriguing thing is that this even happens at the login prompt.  When I launch Firestorm I can't even enter my user name.  I would type my entire user name, my PC would store those keystrokes in memory, but it takes at least 2 minutes to display the first character, and then another 2 to display the next one, and so on.
• If trying to switch to another window on my desktop, the command Alt+Tab doesn't work, I have to click on another window using my mouse.

I have no idea what could be causing this.  I am using a wireless connection, but my FPS are decent so I doubt that is the problem.  

I recently did a clean reinstall of FS, but the problem appeared again after just a couple of hours of being inworld.  Here are my desktop specs:

• OS:  W7 SP1 64-bit
• Graphics Card:  Intel HD Graphics 2000 (9.17.10.3223)
• Processor:  Intel Core i3 2120 3.3 GHz
• Motherboard part number:  Can't get the actual model and part number, but I had a Dell Inspiron 620, if that helps.
• Keyboard:  Logitech Wireless K520
• Accessibility Settings:  None

Any help will be greatly appreciated.  Everything was working great, until about a month ago that this started happening.  I might have changed a setting along the way, but the reinstall should have fixed that.

 

[Incoherendt Randt]

Do you have an old plain wired keyboard and mouse sitting around anywhere, or could borrow them from another PC to test those?

 

[EligibleJam]

I just spent 2 1/2 hours inworld using a wired keyboard.  No lags.  I'll keep watching.  I'll be damned if that was the reason!

[EligibleJam]

To close the loop on this issue ... it was the wireless keyboard.  As soon as I switched to a corded one, all my problems were gone.  This was very unexpected, as none of the other applications installed on my desktop ever experienced any problem.  Thanks for all your help.