Performance report

[MewPurPur]

This report uses splash.svg, an SVG made only from paths, with one of the paths being very long. While this isn't exhaustive, it's pretty representative in my opinion of the things that need to be acknowledged.

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Changing the text gave my laptop a 200ms lag spike. Let's go over some of what I consider interesting. Note that some of the below might overlap:

• 10ms go into parsing path data. (5%)
• 0.2ms go into drawing the multilines for tangent handles (0.1%)
• 4.8ms go into drawing the polylines for contours (2.4%)
• 6ms go into the contour math (3%)
• 1.4ms go into drawing the handle textures (0.7%)
• 0.5ms go into checking if the "Optimize SVG" button should be enabled (0.25%)
• 5ms go into drawing LineEditButton (2.5%)
• 80ms go into drawing path commands (40%)
• 1.8ms go into the additional drawing of number sliders (0.9%)
• 1.2ms go into the additional drawing of color fields (0.6%)
• 13ms go into the inspector rebuilding (6.5%)
• 5ms go into redrawing the graphic (2.5%)

Would be great if we get to identify more things.

[MewPurPur]

My current ideas are:

• Multiline drawing can be optimized by using the built-in method in Godot 4.3
• PathData should become something like 2x faster when the performance of match in GDScript gets addressed by the Godot contributor gang. Other than that, we may still be able to get minor gains from optimizing the logic. The biggest thing would be interoping with C++, which appears to be a bit of an undocumented hassle.
• Inspector rebuilding could maybe be optimized a little more too, by drawing things before they are really added.
• Lazy loading would be useful in the inspector, if we can get it to work.
• It might be smart to not draw path commands until they are on screen.
• It might be possible to draw path commands (which are just a bunch of the same stylebox) more efficiently.
• Polylines can maybe be optimized by grouping them up (they are currently one per command, but for example, a lot of consecutive lines can be made into a single polyline)
• Multithreading; but for now, the only idea for multithreading I have is for the graphic - which can be split into smaller strips. It doesn't seem like there are good gains to be made there.