When my first gen iPad was no longer able to keep up with the increasingly bloated web, I sold it and got a 3rd gen. Eventually that too succumbed to the increasing bloat.
The Safari tab reloading was one of the biggest problems. If I was writing an HN comment on the iPad and needed to look something up, I had to select my in progress comment, copy it, switch to Notes, and save it there just in case Safari decided to refresh the HN tab. If after my lookup, Safari did indeed refresh the tab and wipe out my comment, I'd try pasting. Sometimes that would work, but sometimes that was gone. Then it was off to Notes to grab the saved copy and paste it into Safari.
The iPad Pro was fairly new at this point, and I considered getting one but could not find anyone who could tell me if they ad improved memory handling enough to get rid of the issue. Instead, I went with a Microsoft Surface Pro 4. The browser situation wasn't the sole reason--I also wanted something with a stylus what would be good for writing math/physics/electronics notes, and I had seen several positive reviews by scientists and engineers of using OneNote and the Surface Pen for that.
Browsing on SP4 was great--I could have many tabs open and switch between them without losing anything. The Pen and OneNote worked well too.
However, I'm not sure I can recommend Surface Pro. I used it heavily for a couple years for browsing, reading PDFs, and taking notes. But then I took advantage of Comcast's baffling iPad offer [1] and got a 6th gen iPad.
The iPad quickly became my choice for light browsing. Later I got an Apple Pencil and the iPad took over most note taking (using the Notability app). (I just really need the electronic equivalent of paper with multiple ink colors and copy/paste, and so a simpler program that does that well is fine).
After a couple years of that, with the iPad used daily and the SP4 used less frequently--the SP4 battery is heavily degraded. I think part of this is because it is not obvious how to really turn an SP4 off so if you take a fully charged SP4 and don't use it for a week it will be significantly drained. So even if you are infrequently using it, you are still putting mileage on the battery.
At 4 years old, now my SP4 does not run very long off charger. An out of warranty battery replacement from Microsoft is something like $500.
My iPad battery is degrading much slower than my SP4 battery did. I'm confident it will be in way better shape when it reached 4 years old than the SP4 was. And if it isn't, an out of warranty iPad battery replacement from Apple is $99.
Anyway, if you need to do a lot of browsing in multiple tables using a tablet, and are OK with the power management issues I mentioned above, the Surface products might be worth a look.
[1] Comcast had an offer open for a while to most of their subscribers to get a 128 GB WiFi iPad for $5/month for 24 months (which you could pay off faster if you wished). That's $120, which was around 1/3 of what you'd expect to pay.