[SFK]

1. I have a 4mb video card so I have to use 'software rendering'. Is there any tweaking I could do in the options that might improve the speed?I am using Pete's software rendering plugin.

2. The music sound like a broken old record. How do I fix it. I am using Null2's SPU plugin for sound,which is the most recommended one.

 

[sxamiga]

I would say to upgrade your video card and soon. For best sound, IMHO, give Iori's SPU vers. 1.46 a try. It is an excellent SPU and it is the one I'm using.
sincerely,
sx/amiga

 

[Adair]

Also to speed emulation make sure you have no programs running in the background.
For sound, as sx/amiga suggestted Iori's plugin is quite good. I use Iori's it often myself, but the best sound plug can very easily depend on the game itself. So if you have troubles do a search on these forums for: a) the plugin you want to use, or b)the game you're trying to play.

 

[Betamax]

Although not preferable the best speed boost you would get would be to disable sound (apart from buy new hardware of course )