There are a lot of things that can be slowing your app down You could have too many lists, too many visibility rules, too many lists with auto refresh, too many nested lists, your lists could be displaying too much info (like lists with 100+ records), etc.
With the order of things loading in the app, placement would be your best bet. You can simply re-organize the layers and add rectangles as spacers wherever you need them (for content shifting issues).
Unfortunately, there’s not enough info to be able to help with specifics. You may want to reach out to an Adalo Expert for a consultation/walk-through. Feel free to shoot me a message if you want me to help.
If you notice anything specific, you can always jump back into the forum for help but the more detail you provide, the better it will be for all of us to try to help you.