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when I run my game it plays at 30fps which is fine, but when I add a health bar overlay this drops down to 20fps for some reason. Is there any way of having an overlay in camera view without a significant performance drop? Thanks

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Short answer, no. UPBGE 0.3's overlay pipeline is somewhat lacking in terms of performance.

Here is youle one of the core developers explaining a partial solution earlier this year to someone else who had a similar question about his UPBGE 0.3 project:

enter image description here

Manually constructing your own UI with the BGL/BLF modules' would be better. Here is the blend that youle shared in the screenshot:

https://cdn.discordapp.com/attachments/719228680374583337/903281343142703114/post_draw_callbacks.zip

Additionally, UPBGE 0.2 has better overlay performance for now, so if possible, use one of those release versions instead.

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  • $\begingroup$ I see, is there a way to use this script to show images instead of text? $\endgroup$
    – Minato
    Commented Dec 31, 2021 at 2:24
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    $\begingroup$ Personally I've never been able to draw images with BGL (Blender OpenGL module) on my own, although I know many have been able to, whether in BGE, UPBGE 0.2 or UPBGE 0.3. Here is one a UPBGE 0.3 UI framework though: github.com/mysticfall/alleycat-ui $\endgroup$
    – RPaladin
    Commented Jan 1, 2022 at 3:58

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