fps are so different (Delphi vs. Lazarus)
lazarus / 70-OpenGL

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todhuk · 2017-08-28 20:08

I compiled the Multi Proxy Sample of Delphi and Lazarus.
I found a great difference in fps calculation.

Multi Proxy Sample
Compiled with Delphi 10.2 : around 1600 fps
Compiled with Lazarus 1.8RC1 : around 75 fps
Why fps are so different?

System: Windows 10 64 bits; Video: NVIDIA Quadro 2000;
CPU: QuadCore Intel Xeon W3550, 3200 MHz; RAM: 32 GB
GLScene vertion 1.5.0

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Xor-el · 2017-08-28 20:29

what optimization level did you use for FPC?
Is it a code you can share?

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Akira1364 · 2017-08-28 21:20

Looks like VSync is turned on in the Lazarus version, but turned off
in the Delphi one. Is your monitors refresh rate 75hz? Check the value
of GLSceneViewer.VSync in both versions.

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BeanzMaster · 2017-08-28 21:36

Well seen, Akira I forgot to specify this detail on the forum of
GLScene.

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todhuk · 2017-08-28 22:41

I did optimization as BeanzMaster said (in GLScene forum) and got 500
fps (with Lazarus/Typhon).