Hi Turnip,
thanks for the boot log. I have checked it and it is clear now that the delay is caused by huge kernel CI (code integrity) processing, which is triggered, when process AvastSvc.exe tries to load a .dll. The .dll has an embedded signature, but system is trying to parse all system catalogs (.cat) file to validate the signature of the .dll file, which is strange. There might be a problem with authenticode signatures of some .dll files.