I just finished porting my guitar library from Kontakt 5.8 to HISE and was positively surprised about the memory and CPU usage of HISE(compiled to 64 bit VST)
Memory usage Kontakt: 190MB
Memory usage HISE: 103MB
CPU difference while playing the exact same thing:
The timer in kontakt is set to 1ms resolution while the one in hise is 4ms, having them set at the same value results in about twice the cpu usage for kontakt instead of three times. but the HISE version has arrays of twice the size compared to the kontakt script, so it iterates over more data per timer tick.
Hopefully I don't encounter any issues because this really makes me want to go 100% HISE in the future.