Media Encoder / After Effects render too slow and freezing

Hey!

I'm trying to render an AE comp with Media Encoder, but it's taking so long... I left it to render during night and it the estimated time was 4 hours (it's a 2:30 video full of effects such as Keylight and glows). When I woke up (6h30 later) it had only rendered 25% of the video and the estimated time was 24h. Obviously I cancelled everything.

I tested rendering the first 10 seconds in both AE and ME. In AE it took 4:40 min (Quick Time / Apple ProRes). In Media encoder (H.264) it took 10:40 min. It seems ME is not using my GPU at all, even though I have GPU acceleration activated everywhere. It even looks like my preview in AE is faster than ME render.

When I used to do the same at work with CC 2019 I didn't have this problem.

Can anyone help me with that?

My configs:

CPU: Intel i5 8400

GPU: RTX 2060 Super
RAM: 32 Gb / 2666 Mhz

Storage: 256 Gb SSD (for OS and softwares) and 1 Tb for files and disk cache