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Created attachment 96594 [details] profiling snapshot tried to check new view hierarchy on big C++ files. opened big file, pressed Shift and hold DOWN arrow for 3 secs => IDE is frozen and after 5 minutes was unfrozen with 500 lines selected. Editor is again unusable for big C++ files
I think this was already reported as 182900. There is also 182961 reported for the performance on big files. *** This bug has been marked as a duplicate of bug 182900 ***