Is it normal that the dev version of my app is slower than my live version?

Hi,

I’ve noticed that sometimes the test version of my app is horribly slow, but the live version fortunately is much faster. Is this normal? Why does it happens?

Does the amount of storage used in my test version can be the reason for this?

Is there a way to fix it without deleting data?

The main reason why I want to know this is because its important to me to know if when my live app scales and it starts having more storage used, it will become as slow as my current version test app.

Thanks