B2 4.9 is 33% slower to start-up than 1.68

[Kojoley]

ver	ms	%
main	190	133%
4.9.6	190	133%
4.9.0	190	133%
4.8.2	174	122%
4.8.0	174	122%
4.7.2	158	110%
4.0.0	158	110%
1.68	143	100%
1.65	143	100%
1.60	143	100%

Created a folder, put empty Jamroot. Created src/tools/none.jam:

import feature ;

feature.extend toolset : none ;

rule init ( version ? : command * : options * : requirement * )
{
}

time ../b2 toolset=none

Compiled with Visual Studio 2022 Developer Command Prompt v17.6.0-pre.2.0. Same compiler flags.