@krruzic maybe transcoding? I know on Mastodon at least the most intensive part of posting media seems to be transcoding.
@krruzic can't say for sure. I'm not familiar enough with pleroma to know if it would leverage GPUs for image and video processing. In the case of mastodon it seems to eat lots of memory for what it dies, and provisioning 4 vCPU cores instead of the initial 2 when I waa the only user helped with performance...and postgresql was actually fairly modest with resources relative to all the other moving parts.