Turn off "This webpage was reloaded because it was using significant memory"
I use some memory-intensive web applications. Since updating to Mac OS Big Sur, they have become unusable because Safari frequently refreshes the page (causing me to lose progress and I have to start the task over again) and displays the message "This webpage was reloaded because it was using significant memory."
I love Safari, but this makes it totally unusable for me. I've had to switch to a new browser for many tasks because Safari just reloads the page and causes me to lose my progress.
How can I turn off this automatic reloading of webpages? Surely Apple engineers wouldn't program in something that could so easily interrupt many peoples' workflows without also adding a way to turn it off...
MacBook Pro 16″, macOS 11.1