Not necessarily. There are many bugs in open source and having the access to the source doesn‘t mean it‘s easy (as in, it doesn’t take at least a week) to local

Not necessarily. There are many bugs in open source and having the access to the source doesn‘t mean it‘s easy (as in, it doesn’t take at least a week) to localize the bug. If you claim it is I have a task or two performance issues for you, in the open-sourced Firefox. Thr issues exist for years, and the cause(s) is(are) still not narrowed down.