Very High CPU Usage

I use v3.4.0.1145 and OpenSSL 0.9.8.e and I have Very High CPU Usage, usually ~90% during full speed transfers. I have a 10mbit connection and as the speed increases, so does the cpu usage. I tried changing TCP/IP Buffer Sizes and I never use speed limits but I still have the High CPU Usage problem. I also tried w/the public beta v3.4.1.1170 and it's the same as the stable release v3.4.0 1145, very high cpu usage. I tried both versions of openssl, openssl_098d and openssl_098e and I tried ssl vs non-ssl transfers but nothing helps. As soon as the file gets to approx. 70-80% done, the cpu usage drops from 95% to 15% or less until it's complete then shoots right back up to 95% again when the next file starts.

My buffer download trials:
1kb = ~95% cpu - full speed 941.7 KB/s
10kb = ~95% cpu - full speed 920.3 KB/s
16kb = ~5% cpu - 10% speed 96.1 KB/s
32kb = ~5% cpu - 20% speed 199.2 KB/s
64kb = ~35% cpu - 40% speed 372.0 KB/s
96kb = ~50% cpu - 60% speed 586.4 KB/s
128kb = ~70% cpu - 70% speed 681.3 KB/s
256kb = ~95% cpu - full speed 943.2 KB/s
(default) = ~95% cpu - full speed 932.8 KB/s

I hope that helps. If u need screens or any additional info, just ask. I hope this gets fixed soon, it's extremely annoying.

Chris

what happens if you completely disable firewall and antivirus?

Bingo! Firewall was the culprit. Didn't go above 20% cpu usage after I disabled it. Piece of crap software. Sorry I didn't think of this but thanks for ur help.