Adam,
Your browser and devtools has actually nothing to do with Wappler and its memory use. Those are two separate programs that has each its own memory and cpu usage. So lloking at the browser devtools helps nothing for Wappler's memory usage.
As for your crash in Wappler, it doesn't seem related.
Are you sure it happens on every page - or a very specific page?
Does it happen each time?
Seems like something might be corrupted with Wappler, so if it happens so often you can try a clean install of Wappler, as described in: