30 sec Mac freeze when sending files

There is a BIG problem with my (Hotline) server. Can anyone PLEASE give me ANY help with it.

Here's the situation:
Sometimes, when someone is downloading from my server, the server gets BIG lags (my Mac freezes for like half a minute and I can't do anything (but my arrow DOES move) and when my modem has paused sending the file (the Send Data light on my 28.8K SupraFAX (Supra software updated to 33.6K) goes off for a while). And then I can continue to operate my Mac (Performa 630 68K - System 7.5.5) but only for about 5 seconds, sometimes even less.

Often it seems that one user is getting a great speed and the others are complaining about the lags to. But I don't know if my problem depends on that one lucky user or on some problem with Hotline Server or a problem with my Mac software or hardware...
Is it because the send package of my modem is too high ??
Could I lower this value so that I get at LEAST some time to USE my Mac ??
Or has it got nothing to do with my modem or its software??
I have Open Transport 1.2(.2 ?) and have never really experienced any problems but this IS the first time I run a server.
Anyway, any help would do!
StoneAsked:
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mazurCommented:
Well THIS sure sounds familiar!

Although your situation is somewhat different, the symptoms sound exactly like a problem outlined in my question, "Network freeze for 30-40 seconds." I hope you took a look at it before posting your question since I just closed it out. In case you didn't, I'll save you a few points by giving you the gist of it -- it seems to boil down to shortcomings within the MacOS that won't go away until Rhapsody.
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StoneAuthor Commented:
That really sux!
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