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I encoded about 100 1080p-sized images to AVIF yesterday. I was a little disappointed that each of them were taking about 30 seconds, fully loading an i7-2600 CPU. Realtime AV1 encoding is good news, maybe those optimizations can reach the still image format?

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Your CPU is missing AVX2 & AVX512 (and numerous other CPU extensions), the amount of optimiztion that can happen for your CPU is limited.

https://en.m.wikipedia.org/wiki/Advanced_Vector_Extensions

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