Has their been any change on MODULARGrid's side?

Nothing that should lead to bad performance.

Have more tracking cookies been implemented. Are you cross tracking? I'm using same browser, computer and fiber connection with no problems with loading speeds elsewhere.

No. We have Google Analytics and ReCaptcha. Nothing creepy besides the usual Google creepiness.
I look if I see strange behaviour.

Beep, Bopp, Bleep: info@modulargrid.net