Very Slow Performance

[K7LER]

Project has a form that has a SVGIconImageCollection. This is autocreated in the project settings. There are 270 icons in the collection.

Almost all my other forms are created and disposed at run-time. Almost all these forms use a TSVGIconVirtualImageList that refers to the above form with the SVGIconImageCollection.

When that form is created, it can be very slow before the form shows during. It is almost like when that form is created, there is a whole bunch of rerendering of the images at run time each and every time.

I can certainly look at using Skia to render the SVG's at a resolution to a TImageList or TImageCollection at runtime, with all the forms pointing to that instead, but wasn't sure if there is something I am missing, like an option, to prevent the re-rendering.

[K7LER]

Delphi 12 project, BTW.

[pyscripter]

Every time a VirtualImageList is created. or its size changes due to DPI changes, each of its images is rendered to a bitmap. If you render 270 images and depending on the size and complexity of the images, this can lead to a noticeable delay. Especially so, if your form opens into a monitor with a DPI <> 96, because then the images are rendered twice (I think).

What you can do to speed things up:

• Each VirtualImageList should contain only the images used in the form, not all of the 270 images.
• Use something like https://svgomg.net/ to optimize and reduce the size of the svg images.

FWIW my main for has a vitual image list with around 120 svgs and I see no delay.

[carloBarazzetta]

Any other feedback? or the problem is resolved?