35-45C on regular use.

Is WebGL and WebGL2 Hardware accelerated?

Yes

Is GL_RENDERER your R390?

Yes

AMD Radeon R9 390 Series

Webgl doesn't change anything, same for 32 & 64bit C2 & browser. All drivers are updated. Ram (Dual channel DDR3 4x8GB) is perfectly fine, no faults detected. No malware detected either. Windows event logger doesn't show any useful errors.

Stable 15-20% CPU utilization at ~50C. The only thing I'm seeing here is the slight overclocking that I'm using, but could it really be the case?

Yes.

This is most likely something with my PC. ANY project has the same issue. It seems like it gets a bit more intense with more stuff in the project, but it's always there. And yes, if I take these projects from my PC onto my much slower laptop, there will be no issues. It will most likely be the same for every other device. And it's nothing like a performance drop, more like very short multipe feezes every few seconds, which are clearly visible even when fps drops by 2, because of the freeze. Drivers are updated, reinstalling doesn't help either. It's the same for every C2 version. Or at least from what I've tested. I've tried newest version, older, much older, and my regular use steam version. Same thing. Surely it's something with my PC, but I have absolutely no idea what could it be. Nothing else has this issue.

Sorry for the late response.

Do you experience this on every preview browsers ?

-Yes, every preview

Did you test it under export, NW.js included ?

-Yes, same thing for exports, even with NW.js

Have you got two graphic cards, (...)

-No, I only have one graphic card

Do you develop from a laptop computer ? (...)

-Desktop

Do you have a lot of iterations through objects (loops) that occur each tick in your C2 project event sheets ?

-It doesn't matter. FPS drops occurs even on an empty project with no code in event sheets

Did you look at the number of objects being created while debugging ? Maybe some objects are not destroyed.

-Again, it can even be an empty project with no objects in it

Are you on Windows 7 and not using the Aero (graphic interface) ?

-Windows 10

It seems like the FPS drops are occuring mostly with CPU utilization drops, though it's a very significant amount, about 3% difference with my Intel Core i5-4690 3.50Ghz

That's what I did. Same for the text object. I've also tried different browsers, including NW.js. Same results.

All of my C2 projects are suffering from constant frame drops - stable 60fps, then after a few seconds massive drop to 40-50fps for about half a second. This is VERY noticeable and makes fast-paced games unplayable. Occurs on any project on my PC - even a newly created project with nothing in it.

It only seems to happen on my PC. Anything else, including my much slower laptop doesn't have it.

I've tried different C2 versions, including newest, old and steam version. Same thing on all of them.

I'm guessing it's something with my PC. Any ideas?