It describes the same issue I'm having and a suggested solution by aldostools. It does indeed not crash when setting 'showClockSpeeds: Off' for the XMB at this location; http://0/edit.ps3/dev_hdd0/tmp/wm_res/VshFpsCounter.yaml
I didnt notice this issue on 4.90 CEX with webMAN MOD v1.47.45
I am noticing a bug when using webMAN MOD v1.47.45 and Evilnat 4.91 CEX. When I activate the show FPS screen (L3+R3) for webman the system crashes after around 15-25 seconds. I have found this older thread ( https://www.psx-place.com/threads/webman-mod-general-information-thread.9643/page-102 )
It describes the same issue I'm having and a suggested solution by aldostools. It does indeed not crash when setting 'showClockSpeeds: Off' for the XMB at this location; http://0/edit.ps3/dev_hdd0/tmp/wm_res/VshFpsCounter.yaml I didnt notice this issue on 4.90 CEX with webMAN MOD v1.47.45