Speed drop after playing game (Crysis3)

[Rolf]

Like Jeremi said, this is absolutely normal and there is nothing you can do about it, shaders can't be "reserved" to one task only, unlike CPU cores.
"Low resource utilization, you can still watch movies or play games while cracking" means you can still do X while it cracks, but there will always be speed drops in such cases.
The heavier the load on the GPU by X, the slower the speeds get, simple as that.