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I have mounted a local directory with approx 10000 Java source files in it. Searching through this directory with a regular expression becomes as slower as the result tree grows. After 700-800 hits its VERY slow. Also the search tree also needs more time to respond to a single mouse click. This should be improved. Additionally, if "Prescan Sources" for java files is enabled, it also gets activated for the search results. This is IMHO not necessary, because the user is usually more interested in the search result "as-is", and not the compile status. But more importantly, prescanning the sources let the memory consumption go through the roof.
Same performance problem is described in issue 19484. *** This issue has been marked as a duplicate of 19484 ***
Resolved for 3.4.x or earlier, no new info since then -> closing.