V24.4.1 Takes ages to export and the video has green flashing throughout

I've updated to 24.4.1 and now anytime I try to export my work it takes ages to export, for example what would usually take 8 minutes is taking over 3 hours and it knocks the guts out of my Mac... litrally taking all the power just to export (This isn't normal) and when it's done the video is full of green flashing. I had this issue in the version before that as well.  I'd like to be able to use the new versions.

My computer is:

Apple MacBook Pro

2.2 GHz Quad-Core Intel Core i7

16 GB 1600 MHz DDR3

Intel Iris Pro 1536 MB

I've been using this laptop with Premiere Pro for years and haven't had any issues before this new update.

How can I mend this please?

Thank you.

Kind Regards,

Ben.