I have 1024 in memory at my page. But yes you are correct about the relationship!
You have access so you can just “grab” the gedcom file for testing!
I have been able to confirm that the problem is server capacity. I can’t tell you exactly how long it took ( but I might try again with statistics enabled), but before starting I set my server to have 2019M memory, and 3000 seconds before time-out.