Thanks a lot Greg.
As I reminded, before Cura 4.10 there was no anycubic mega s/pro profile, only the mega standard one. So yesterday evening I tried to use that printer definition file and in that I can use a faster retraction speed.
Something curious happens also. With the same settings, also for retraction speed ( 40 mm/s) with the standard mega profile the time for the print was 23 minutes, with the cura mega s/pro profile was 33 minutes. Everything was the same, only the definition configuration changed.
Can you explain to me how a definition file is made?
Thanks