So my PC is not the best but it should run Minecraft smoothly without any problems if otherwise all esports games are running easy and my friend with the same PC has 120fps so in Minecraft I only have 60fps why I don't know vsync is on but also when it is over I have the same problem and not only that I'm capped at 60fps in the gomme lobby I'm capped at 14fps and in other lobbies once at 30fps I do not understand what is going on
Well-known servers are quite full and draw a lot of power. But there's in Minecraft settings (ingame not in the launcher) the possibility to increase the limit of 60 if your pc can. But doesn't bring you much more on the lobbis. But personally I think 60fps is enough. Have worse pc with sometimes only 10fps. It can also be that you have programs running in the background.
Hope I could help