optimize download speed

[kalos]

hello

I have several applications that are downloading, usenet program, download manager, bittorrent program, browser, etc

what I want is to set download speed limits for each program, but these limits should be dynamic, which means the limit will adjust in specific circumstances

for example, if there is browser activity (there is some downloading from the browser as I browse webpages), the download manager will obey a speed limit
when there is no browser activity, the download manager will download at unlimited speed

is there any program to do this?

thanks

[Lashiec]

NetLimiter seems to do exactly what you are asking for, with their 'granting' system.