Text Box getting worse?

This issue plagues me.

Running Firefox alone, no other apps running. 1 tab only. Interested to hear other people’s experiences and CPU load or computer specs. I have a ticket raised and have had msgs with one of the Adalo devs.

I can be building custom lists, adding relationships, navigating around 60 pages and CPU strain is max 80%. As soon as I drop a section of text on the screen CPU boosts to 350% and I have to wait 30 seconds between key strokes. Copy paste and moving the text element around is awful.

Running 2014 Macbook Pro Retina on Mojave
Hardware Overview:
Model Name: MacBook Pro
Model Identifier: MacBookPro11,2
Processor Name: Intel Core i7
Processor Speed: 2.8 GHz
Number of Processors: 1
Total Number of Cores: 4
Memory: 16 GB