Why has my speed dropped?

[sidders]

I encoded a d2v project using cce at 0.750 frames per second yesterday. Today I ran the same process (same avisynth etc) and it ran at 0.62. I have installed a few programs such as TMPG etc, but I can't see that this has made a difference. Any suggestions? Would a defrag have any effect? Which is the quickest version of AVISynth / MPEG2dec.dll etc?
Thanks

[sh0dan]

AviSynth version?
Script?

Could be that your amount of free memory has dropped, and your cache therefore is smaller, but it shouldn't be enough for you to get so big a penalty.
The lastest (2.05) is the fastest. Don't know about mpeg2dec though.
YUY2 decoder could be an issue - have you installed huffyuv, ddshow, ffvfw, DirectX 8.1 or anything like that?

[sidders]

I've tried different versions of AVISynth (1.03b, 1.06. v2 etc) and couldn't get the speed back up. I'm just using a basic script, MPEDDEC.dll, d2v, resample audio etc
I'm wondering whether I've installed some kind of filter (direct show or something) in another program. Maybe I'll uninstall everything and try again.

[WarpEnterprises]

IMHO a good speed test for AviSynth Filter is to add
Crop(0,0,8,8)
as last line, open in VirtualDub and SaveAsAvi.
Due to the small dimension you only see the filter speed.
The next test can be to crop in VirtualDub, so you get the data rate AviSynth->VD.