I made several tests now and entered the results into the table above. The results for R4.0.4 are pretty close together. Neither the CPU type nor the type of disk connection (SATA or USB3.0) nor the kernel version make any big difference.
For R4.1, Qube startup is a lot (nearly 30 %) slower. The start times for R4.1 are close together and do not show the large variances that occured with R4.0.4:
9.21
9.38
9.34
9.24
9.18
9.22
9.16
9.31
9.00
9.01
Mean: 9.21
Median: 9.22
Variance: 0.02