JS-heavy sites are night-and-day faster on iOS, thanks primarily to faster CPUs (which is mostly due to better L2/L3 caches). The iPhone X has 8MB of L2 cache; your sub $200 phone likely has no L2 at all. Even high end Android phones have, at most, 1MB of L2 cache. This shows up pretty clearly in Speedometer scores.
You would think so. But man, even sites like newegg and amazon would drag terribly on my old phone. And many news sites were sooo painful with all their ads.
https://browser.geekbench.com/ios-benchmarks https://browser.geekbench.com/android-benchmarks