Christian Beikov commented on MYFACES-4225:

Hmm, you are right. I must have overseen that, but it isn't caching that a file 
doesn't exist. Is there any reason for that?

> [perf] Cache whether a library exists in ExternalContextResourceLoader
> ----------------------------------------------------------------------
>                 Key: MYFACES-4225
>                 URL: https://issues.apache.org/jira/browse/MYFACES-4225
>             Project: MyFaces Core
>          Issue Type: Improvement
>    Affects Versions: 2.2.11
>            Reporter: Christian Beikov
>            Priority: Major
> I'm seeing many {{sun.nio.fs.UnixException}} being thrown in the underlying 
> code because {{ExternalContextResourceLoader.libraryExists}} calls 
> {{ExternalContext.getResource}} which in the end checks if a file exists on 
> the FS. I'd suggest when the project stage is PRODUCTION, this should be 
> cached. Maybe this could be done by installing an {{ExternalContextWrapper}} 
> that caches all resource lookups? I just see that parsing a XHTML causes many 
> exceptions to be thrown internally which negatively affects performance.

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