asovse1 wrote:
I don't think the client is IE based anymore. After that update, I felt like it had a major speed boost. Which is good, IE never liked my system anyway.
That's right. I think from memory it runs on their own integrated version of OpenJDK java. I may just be entirely speculating there but the point being at least that they've turned it into a full client rather than just an IE frame.
To add to that, the browser you use won't (or at least shouldn't) affect RuneScape's performance. They all implement whatever version of Java you have installed separately on your computer, whereas the RS client implements its own version. This is why you could notice a difference with the RS client compared to browsers, but browsers will only differ against each other in their load times etc.
So that makes the choice a little easier for you.

Browser or client?