render time varying heavily!!!

[shaggray]

i am rendering test files to check out different settings.
this is not so easy, because render time is varying every
time i hit the render button

without ANY changes, i get different render times:
first try: 1:05 min
hit render again: 1:35 min
again: 2:00 min
again: 1:10 min
again: 1:45 min
again: 1:00 min
.
.
.
.
.
what`s going on?

[natty]

What version ?
can you post your file ?

[ml-a]

are you using different softwares in background? like messenger, viruskillers, winamp, .... i dont know...what else?
If yes shutdown every soft when you are doing tests like this. Variations of 30 seconds happends to me either when i does some tests before.

[franquy]

If you try reset irradiance map, and render again?.

[travistlo]

I remeber reading through the 1.5 help and there is a setting that can make your times change for each render, even if no settings has changed. I started looking again becuase i could not remeber what it was. If you read through the help, the answer might be in there.

(or it could be something of of these guys/gals said)

travis

[Long John]

If you try reset irradiance map, and render again?.

he don´t wrote he used it at all.
the effect when reusing the solution should be different anyway.

that is really strange i think.