I saw a lot of people complaining about a lot of lag lately. So I decided to do a guide, maybe I can help you.
I.
1) Go to System options (press ESC -> system options).
2) If you have an old PC with a weak performance press CPU at graphic. If you got a better PC choose the GPU option. Then press apply. This will not change the interface, but will lower the chances to have lag, the choice depends of the performance of your PC.
3) Choose Snow OFF. I guess I don't have to explain you why is this good...
II.
1) Run the patcher. But don't press play. Press options.
- Resolution: it should be 16bp.
- Frequency: 75 or 60.
- Gamma: 1 .
- Uncheck the "Use software cursor"
- IME Mode: Game Mode.
- Fog: near.
- TNL: Auto.
- Shadow : none.
III.
1) Press ESC in-game until you reach options.
2) Press game options.
3) If you have a lot of players near you (for ex in map 1), you can try to press the button "Limited" next to "Name".
4) If you are killing a boss/metin and you hit very fast, and everytime when you hit you lag a little bit try to press the "Hide" button next to "Hit Info" (you will no longer see the damage).
5) If you are in map1 and there are a lot of shops, and you lag, press "Hide" button next to "Shop Name".
6) If you are in a map with a lot of mobs, check if you have the button "Level" and "Aggressive" next to "Monster info" pressed. If you do, just disable them.
IV.
1) Check if you have other programs running. Like yahoo, torrent, music, another game etc. Also check if you have something downloading.
2) Check if your anti-virus is updating/scanning. Try to disable it.
This was my first guide on this community. I hope I helped you. If you didn't understand something/or you got a question ,just reply here or PM me in-game (My name is Pr0Sura).