Text Lag

I am using Premiere Pro 2020, and a few weeks ago started having problems with a lag happening whenever there is text on the screen. The lag happens wherever text is on the screen and is in the form of taking seconds to register a selected layer, and increasing / decreasing the video view with the slider bar - this lags to a catatonic level. What used to take minutes is now taking 5-6 times the amount of time to do.
Without text it goes like lightning and I can edit fast and accurately, but add text and it's like someone chained a pallet of concrete blocks to rear of the car and it just can't go. It seems to me that this can't possibly be a hardware compatibilty problem if the video side is unaffected until the text is added, plus as I said at the start it's only been happening in the last 3 weesk or so. I feel like everytime there's an update the program finds another issue to trip over! When I first started using it it worked like a dream, but over time it just keeps getting worse and worse.
Anyway does someone have a solution (in plain English - ie I am not an IT expert!!) - this is driving me insane!