The project I recently worked on had an Adobe Stock picture (1.2 MB, 4430 × 3386, JPEG) and it was generating more than 200 MB of data in the file alone just because it had Generic Gray Gamma Profile 2.2. And when I compressed the project and it went down to 11 MB. And then this difference made me try some other options.
So, without compressing or without changing anything else but the color profile, I applied sRGB (which is widely used color profile as we all know) and it generated only a few MB in the project file.
Although, Iwanted to keep experimenting and when I applied it as Custom Pattern instead of Image as the box background (And I still kept the Gray Gamma profile), it still generated some data but it was around 10-15 MB.
Rendering is working great on Sparkle when it comes to compression, creating webp images and color profiles and so on…
I am seeing a file on your website called “beautiful-color-grad-076-premium-dark” as a gradient. It “could” be the one what’s messing with you.
I did many combinations of the settings I mentioned above including duplicating and using a few versions of the JPEG with Gray gamma profile, on a new project file & on the current one, compression settings, disabling Generate webp… but I can say this Generic Gray Gamma Profile 2.2 can create a lot of data in the project file and it also can be seen when you check Box Backgrounds part under Summary tab.
Hope that info helps to anyone under this topic.