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Двадцативедерное ведро и сто гиг памяти, а потом они такие....
Actually, the speed of the CPU is very relevant to this, as all handle requests are done over it, and when running in battery mode on reduced CPU cycles, it will simply queue up when doing things, and this is the "lag effect" you feel.
So yes, we need to bump the speed to improve the performance here.

As while the graphics renders it, the CPU makes it all happen, so it cannot do this on 700 while still trying to do all else, and have a smooth performance.
Remember that windows takes almost 100% of this when running in reduced mode, when needing to actually just do a change.