1.- Keep your drivers updates (Use Driver Booster).
2.- Keep your pc clean (Virus/Malware). Kaspersky Internet Security 2018 have free version and works fine.
3.- Keep clean your desk, if you have to many files it can reduce your pc capacity.
4.- Defragment your disc every 3 month at least.
5.- Open Task Manager (Ctrl+Alt+Delete), go to Startup, here you can see all programs startup when you turn on your pc. Now select all secondary programs an disable it, keep only the necessary. Can try with Services too.
6.- Press Windows+R, write msconfig and now OK. Go to Boot. Advanced Options press Number of Processors and use the most high number you see.
7.- Tibia Client Settings: On Graphics Engine test yourself what give you more FPS.
8.- Tibia Client Settings: Unselect V-Sync.
9.- Tibia Client Settings: Select No Frame Rate Limit
10.- Tibia Client Settings: Unselect Show Light Effects
11.- Download Leatrix Latency Fix, this give you better ping and its safe/free.
12.- Download and use Razer Cortex, this app is free and safe (Its Razer). When you open the client with Razer it gonna close secondary app and give you more memory ram.