I was playing my survival world and found a Stronghold. While near/inside it, the fps got a little bit crazy (usually is between 30 and 60, but it was over 100), and the game was lagging randomly while walking around or just moving the vision.
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I always play with 4Gb and only had this problem with strongholds, and (today) with pistons/redstone. Minecraft Java Edition needs to improve its performance because it's really bad. I play Bedrock with 32 chunk simulation distance and it run really smooth, Java desperately needs to improve it's performance. Maybe I'll try to increase to 6Gb and see if it works.
Increased my RAM to 8Gb, and the lag still happens, but much less often. And the fps still got crazy nearby and inside the Stronghold.
I can second this... I was testing out seed "3327488709299075106" and my game was constantly crashing when in the vicinity of two of the strongholds (first at x-780 z1440, second at x2380 z-155). Once I increased the maximum RAM allowed from 2G to 4G, the game no longer crashed.