So, I've been always able to host a minecraft server. Whereas it is a Vanilla Server or a Bukkit Server.

Until 1.6.4, I've almost only hosted a Bukkit Server, where I've at least 30 plugins and have had at least 15 people at the same time. I allocate 3Gb of RAM to it. And when I play, I allocate another 3Gb to Minecraft itself. This while on a Skype call. I get no lag, can have high Video settings, with no problem at all, and almost no lag for the people that play on it.

Now, I've wanted to host a Vanilla server for a private Survival with a few friends. And I wanted to do so in either a 1.7 version or a 1.8 snapshot.

This has revealed impossible since I'll start crashing (my FPS - even on the lowest settings; sometimes the server). When I crash, everyone that is playing in the server start getting huge amounts of lag, since I'm the host.

I've tried with 1.7.2, 1.7.10, 14w28a and 14w28b. Always the same result, even though that in the snapshots I can last a bit longer before crashing. I don't know why this happens. I've tried running test runs (I play by myself in the server, with the lowest Video settings, and with no other programs running).

I would really appreciate any help.

Thanks!