Media Encoder stuck and/or unusably slow on projects sent from AE

Hi, has anyone had this? When I send projects to Media Encoder from AE it starts exporting ok but then gets stuck shortly after start and appears to be either stuck completely or doing one frame per minute or sth totally ridiculous, then when I stop it and render directly in AE everything goes smoothly and quickly.

I’ve tried different projects and reinstalled ME, which did not help. Do I need to change some settings or sth?

Thanks :neutral_face: