Framerate works fine in Max but unable to capture it properly

Hey,

I made a patch on Max4Live which is basically a slideshow of images using textureset, triggered by a MIDI input (one note = next image).

It works perfectly fine in Max, however when I try to capture it, whether it is through Spout/OBs or simply OBS, a whole lot of frames are skipped (not in Max, but in OBS viewer and the resulting video).

I froze all my tracks (except the Max4Live MIDI trigger one), closed all my apps, trying to make sure all my computer resources are dedicated to this, yet it still doesn't work.

Any ideas on how to solve this ?

Or is just my computer too slow ? It is an Asus Zenbook 13, with an 11th Gen Intel Core i7 with 8 CPUs, 32 GB of RAM, and an Intel Iris Xe Graphics card.

Many thanks in advance,

Matthieu