[Qt-creator] Mime performance

[Orgad Shaneh]

Hi,

Building the project tree for qtcreator.pro takes about 5 seconds, on which
the GUI is blocked.

I profiled setRootProjectNode(QmakeNodeTreeBuilder::buildTree(this)) in
QmakeProject, and found out that mimetype resolving is the heaviest
operation there.

Is it possible to cache mimetype results? Or at least have a cache for
common extension such as cpp/cxx/c/h/hxx?

- Orgad
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