Problem server lag unplayable

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XDavi797

New Member
Jul 29, 2019
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Hi all, this iis my problem, i started to play ftb with some friends (max 5 connected) and it was all fine, but a day we decided to change map, so we did it, but the new map had a lot of lag, we played until yesterday, so we tryed to create another map, but the same lag annoy us! i don't know how, but it is not playable, sometimes we can't switch items, can't fight mobs, or the game freezes and when it is unfreezed we are dead, and i want to know how is that possible! i changed only the map, what's different from the past map?
some informations: we play direwolf 20 pack, with the lastest upgrade, and we started to play 2 upgrades ago.
my pc is:
acer aspire 5755g
intel i7 2630QM 2GHz with turbo boost up to 2.9GHz
Nvidia GForce GT 540M
6GB ram (i tried to dedicate more ram to the server or to java, but nothing changes)
hard disk kingstone SSDNow V+200

the other specs are useless

please help me, the singleplayer doesen't lag and vanilla too, so it's only the modpack's server, i host it with hamachi and run the client in the same machine, my connection is around 10 M download and 0.70 upload, the ping is around 20, and i'm connected via lan, the only programs i keep open when i play are skype and chrome, and the only reports i get are: [WARNING] Can't keep up! Did the system time change, or is the server overloaded?
the server doesen't crash, but only lags, and the warning message is shown a lot of times, what should i do?
my OS is windows 7 ultimate x64