NSLayoutManager performance degradation when editing large (>10kb) Arabic text
Originator: | abdullah.a | ||
Number: | rdar://37607929 | Date Originated: | February 16 2018, 9:38 PM |
Status: | Open | Resolved: | |
Product: | macOS + SDK | Product Version: | |
Classification: | Performance | Reproducible: | Yes |
Area: AppKit Summary: Editing a large amount of Arabic text (>10kb) in TextEdit (or any app that utilizes NSLayoutManager) will exhibit notable lag (between keystroke and change of text on screen) and higher CPU utilization. Steps to Reproduce: 1. Open attached "slowtext.txt" file in TextEdit. 2. Type continuously somewhere in the middle of the text. Expected Results: 1. No lag. 2. Normal CPU utilization. Actual Results: Notable lag between keystroke and change of text on screen, and really high CPU utilization as typing continues. Version/Build: macOS 10.12.6 TextEdit 1.12 (329) Configuration: Attachment slowtext.txt https://pastebin.com/2Kfu1bgN
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