DOMPDF Timing out

I'm using DOMPDF to generate PDFs from some of my views. It works well on everything except one where it keeps timing out. The code I am using for this view is exactly the same as what I'm using for another which works fine except this one returns more results. I've tried increasing the timeout limit but this didn't help.

Just wondering if anyone has any ideas on how to fix this? I found a few results online but they are all quite old and most of them were a bug with nested tables.

Thanks for your help.