Use
the console client
over any other client.
Move
the client to the start of the partition or hard drive. Defrag
your filesystem often. Check
for dust on your heatsinks. Make
sure the ambient temperature in the case is cool and not like an oven. Run
your client at low priority instead of idle. Consider
running the client at normal priority on a dedicated machine. Always
keep the software up to date. Customise
your flag usage for better workunits. Consider
the use of a ramdrive.
Use linux over windows (stability is key in tweaks).
Makes sure you have a sufficient amount of ram (256mb minimum).
Remove all non required services (NT/2K/XP), go here for help.