Is there any way for a program to be made priority to ensure it doesn't relinquish memory when I multitask?

Due to ipad's limited RAM, it constantly "refreshes" apps/webpages when I go look at some other apps and comeback. Suppose I am reading a pdf document and then my ADHD forces me to go check some other apps, the document goes back to first page and I have to manually scroll all the way down to where I was reading. This is so frustrating considering how often I get distracted. I am even considering not getting Ipad as my next tablet in a few years because of this one little thing that kills my productivity. Is there a way around this? To make sure ipad doesn't free up memory of an app that isn't the most recent used? or at least make sure the document doesn't go back to page 1?