RE: An easy, but very helpful tip : If you have an old phone you no longer use crunching GRC, remove the casing to improve cooling, and with that, perfomance.

[parejan]

Thanks @ivanviso, nice small project. Due to heat dissipation issues I could only use 2 out of 4 cores on my old smartphone but I'll give this a try and see if I can use all 4 now!