A log file had to be created for Technicla Support in order to troubleshoot a licensing problem.
Since then, the Bentley programs are starting up very slow.
Creating a log file can lead to significant performance issues when starting a program,Therefore, the settings should be reset after succesful creation.
Open the License Manager, see:Opening License Management Tool
For newer installations, in the License Manager, select Tools > Options and go to the "Error Logging"-tab.Disable all options under Log Levels
In case the "Error Logging"-tab is not available, which can be due to an older installation, two Windos environment variables were set in the Operating System (go to Control Panel > System, under the Advanced-tab select Environment Variables...):MS_LMDEBUGLOGLEVEL=ALLorMS_LEMDEBUGLOGFILE=C:\AppLICDEBUG.LOG
Both these variables need to be deleted.
Licensing and Activation Forum - MS_LMDEBUGLOGLEVEL