Hi @RubénP
Here are the simple tricks I use.
1. Try to avoid JavaScript and use CSS in most of your custom scenario.
2. Use https://squoosh.app/ and upload your portal images and get the compressed full quality images for your portal. This is huge benefit when you have plenty of images to show.
3. Right click portal - inspect> use light house tool to see what exactly is causing slowness. You will get a significant clue where and which page can be optimised.
4. Try to use lazy loading for large entity lists.
5. Use web api instead of jQuery for bulk operations.
6. When using external libraries / referencing external libraries use minified version.
Top tip: clear cache and press ctrl + F5 this will clear most of the unwanted files.
Hope it helps.
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