[Interest] CPU load in busy indicator widget based on Q(Variant)Animation

Giuseppe D'Angelo giuseppe.dangelo at kdab.com
Fri Oct 4 20:46:27 CEST 2019

Il 04/10/19 16:51, René J.V. Bertin ha scritto:
> I've isolated the class and its demonstrator, and added a few switches to assess performance (in terms of user experience and CPU load). The only way I found to limit the CPU load is by adding a delay after each frame render. 75ms of "thread sleep" already causes an almost 4x reduction in CPU load with a barely visible effect; with 250ms the animation is choppyish but still perfectly acceptable IMHO - and CPU load < 1%.
> github.com/RJVB/kbusygadget
> Am I being principled here or are there indeed cheaper ways to obtain a comparable UI effect?

By default non-QQ2 related animations run every 16ms. Do you have a 
minimal testcase showcasing a suspicious activity of an animation?

Giuseppe D'Angelo | giuseppe.dangelo at kdab.com | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
KDAB - The Qt, C++ and OpenGL Experts

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