Problem: some patterns are used as a replacement for several explicit
extension matches (like '%.[Ss][Yy][Ss]$', '%.php%d$', etc.).
They usually correspond to Vim's "ignore case" regexes (like
'*.sys\c') and "convenience" patterns to not define many of them (like
'*.php\d').
As matching extension directly is faster and more explicit, it should
be preferred.
Solution: move all such patterns to direct extension match.