Why do you need to set -intensity?
Aeternity / Grin requires significant CPU power to aid the mining. You might have sub-optimal performance if the machine is running on a low-end CPU (e.g. Intel Celeron) with multiple GPUs. Optionally, you can experiment with the CPU usage with the -intensity
flag.
How to set -intensity
bminer -uri cuckaroo29://bminergrin.worker:foo@grin29.f2pool.com:13654 -intensity 6
The intensity is between 0 and 12. Lower intensity has lower CPU usage but potentially slower on mining.