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В целом, он вообще никому не нужен

> I have 4 threads CPU and Auto threads for it was 7.

actually it should be 9 according to the math from the sources

In fact number of threads was one of the reasons for "Avisynth 2.5.8 SVP Edition".

Default Avisynth MT's threads scheduler is not optimal.
For example for 2x rate it gives the same performance for even number of threads:
1 thread = 2 threads,
3 threads = 4 threads,
and so on

yeah, I know the reason...
'generate.js' in the 'script' sub-folder was not updated in the Pro package

maintaining too many different versions becomes tricky o_O

> Want me to take a video then?

I believe in numbers

If you take some script and run it through AVSMeter with different (increasing) number of threads you'll see that at some point performance (and CPU utilization) won't increase any more.
Assuming that we're talking about GPU acceleration = ON and FRC rate no more than 3x, for a dual core CPU this number can't be more than 5 threads.

There was an issue with incorrect ffdshow buffers sizes in pre-rev.60 versions that led to stuttering at some "magic" number of threads. This's why changing it to some value other than "auto" helped in many cases. NOT because "auto" number of threads was not enough.

> with my measly dual-core Pentium G3258 (though admittedly overclocked to a not-at-all-measly 4.6GHz) need to manually set the threads to at least 7 (sometimes 9)

it just can't be true

how the hell have you managed to insert BB codes inside the script?

...or just update to the latest rev.66

"App.settings -> Additional options -> Reset to defaults"

what video are you trying to play?
is it a regular file on the disk or something else?
what "source file" string do you see in the ffdshow properties on the Info tab?