API running extremely slow

I just launched an app to live and I have some APIs to loop through list of things and check their values and/or create things based on their values.

It’s running extremely slow. As it is an app for professional services the client is extremely dissatisfied (as they should) and now feels like 3 months of work will go to the sink and Bubble became my nightmare.
Again, The actions are really simple. Just looping through to create things and check values.

any ideas on how to improve that?