Of course, yes, it's doing lots of extra traffic calculations.

Some things to try; https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=465790009

I suggest checking for errors in the game log (output_log.txt) because usually impact on fps is negligible (unless you have slow PC - I do have, really slow, but I don't see any difference in FPS on my saves with 150-650k citizens)

I was experiencing a massive slowdown after the June 2nd 2022 update, had a solid 60 fps, but yet all traffic was moving in slow motion. I noticed some stuck cims, thus I hit the "reset stuck cims and vehicles" button in the maintenance tab of the mod's setting and voila, everything runs smooth again. So, if someone else finds this thread, this might be your issue...

It's probably because at the same date Node Controller Renewal released a fix for stuck cims so they got unstuck which most of the time overloads simulation thread because of the amount of new collision checks. Freeing cims indeed fixes that probem because they are either despawned of removed from collision check detection.