Xcode 8's "Comment Selection" command is painfully slow
Originator: | guillaume.algis | ||
Number: | rdar://28935025 | Date Originated: | |
Status: | Open | Resolved: | |
Product: | Developer Tools | Product Version: | 8 GM, 8.1 beta (8T47) |
Classification: | Reproducible: | Always |
Summary: Since Xcode 8, the "Comment Selection" command (under Editor > Structure, shortcut ⌘ + / ), was re-implemented as an App Extension. It seems the new implementation has a performance problem. When applied to large chunks of code (say, more than 200 lines), the command is noticeably slow, and will block Xcode's main thread for a few seconds (!). This is a regression from Xcode 7, where the implementation was fast enough that there was no noticeable freeze, even when commenting out large files. Steps to Reproduce: 1. Launch Xcode 8 2. Open a large source file 3. Select more than 200 lines (the more you select, the more the lag will be noticeable) 4. Press ⌘/ to comment-out the selected lines 5. Make coffee and wait Expected Results: The lines are commented out instantly; there's no step 5. Actual Results: The lines are commented out after a few seconds of Xcode freezing and beachballing. Version: Xcode 8 GM Xcode 8.1 beta (8T47) Notes: Configuration: MacBookPro 11,1 Intel Core i5 2,6 GHz 8 Go RAM OS X El Capitan 10.11.6 (15G1004)
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