looking and cant find the perfect one.
i have 100 gig of 4K image-sequence to process.
found imagizer2 on sourceforge. multi-thread but not 64bit (does matter?).
i guess the fastest one will be using intel's IPP image core lib .
i am on windows, but if some crazy fast linux option is available i'll consider (benchmarks?).
included benchmarks i ran on a test batch of 100 5k (4.3MB) files