I suspect it is related to your another post where you used an explicit framerate instead of the Realtime option on your recorder.

An explicit framerate should only be used when you want a non-realtime recording. In this case the systems renders as fast as possible using the maximum possible processor load.

Is this the case?

No in general we noticed that when adding video recorder module the performance of the software hugely dropped. 

So I was suggested to improve the video recorder modules 

The Video recorder can record to different formats. The demand on the system for the different formats vary.

In case of some formats even modern computers can't do real time compression.

You can try to change to a less demanding format or lower the bitrate if your ssd can't keep up.