Frame rates and tweaking

[Nystul]

In large-scale raids (30+ people), the game becomes unplayable - I can count off four or five seconds between my clicking Whirlwind and its actual activation (which means I either die having never used it, or use it twenty yards distant.)

I'm trying to find out if this is client-side lag (i.e., my #$%&ty 56k connection), server-side lag (i.e., #$%&ty netcode from Blizzard), or more related to my somewhat low RAM.
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If you are getting a big FPS drop and harddrive is churning when you have these problems, it would be your RAM. More likely though, it sounds like a connection issue. If it is consistently this bad every time you raid, I would say it is your 56k connection. As far as the efficiency of the network code, whether it is good or bad, it is not something that is likely to be improved upon much if at all.