Rendering slows down after a couple minutes.

Hi guys,

So I have made this audio visualiser video on After Effects which is about an hour and whenever I render it, it renders the first couple minutes pretty fast so it should be done in 1:30 hours, so I went to bed, put on the auto shut down option and when I woke up, I saw my pc still rendering with 25+ hours left. I've been trying to fix this for like 10 hours right now and just can't find a fix. If anyone can help me, that would be very much appreciated. I can send other already shorter rendered video's too (they're on my youtube). It's basically almost christmas so I made a longer mix with it.

My PC specs (in case you needed them):

CPU: Ryzen 5 5600x

Ram: 2x8GB 3600mhz

GPU: RTX 3050