Lag issues

While playing in world this few past days i noticed that my fps increase imminently and very frequently when other players are around or near my character and the game lag so much, and that i dont know why? and i'm getting confused and annoyed in what to do cause it also affects the quest i'm doing. And if it increase some more then i got DC.

But after when i try to get some far distantce from the other players the fps drops and the game goes normal again. Which is sort of weird or probably those are the players that are maybe using 3rd party apps/software game booster. To gain some speed advantage. But not all some few players dont affect the game connection fps at all when there around. So i dont know whether should i file a ticket for this. Or whom to talk too. Cause the management and operators of this game neither wont even bother to talk or find time to talk to it's community whom playing this game.

Well my pc runs an old

AMD A8-7600 Radeon R7, 10 Compute Cores 4C+6G 3.10 GHz processor

DDR3 8.00 GB HyperX fury 1866Mhz ram

Nvidia GeForce GTX 750 Ti 2GB Graphics Video card

2TB WD Caviar sata hardrive

Microsoft Windows 10 (64-bit) OS version

Internet connection 100Mbps Wired fiber Broadband

so i don't know if this is the case cause my pc is old, even though there are times i get an error message saying "Dirextx 5 missing" while playing the game even though Dirext-X 12 is installed on my computer

I test the internet connection from my side the latency seems pretty normal and the ping very low. The windows drivers are all up to date, What i did is i uninstall the whole gameforge game client instead then downloaded again a fresh up to date install of the GF game client then downloaded and install Java onto my pc. And the problem seems to just fix itself up inworld and my character and the game is not lagging anymore.