Solved!
Anyone who has Intel HD 4400 (esp. Lenovo Flex 2) try this:
• open System/Library/Extensions/AppleIntelFramebufferAzul.kext/Contents/MacOS/
AppleIntelFramebufferAzul
• This file is a unix executable file. So you need to use a hex-editor app like
hex fiend
• Press ctrl+f in order to appear
FindReplace section. Replace first code with second one:
Find: <0600260a 01030303 00000002 00003001 00006000>
Replace: <0600260a 01030202 00000002 00003001 00009000>
Done. If you reboot it applied and you no experine any lag anymore but probably you suffer from graphic glitches. So I extremely recommend you to do these stuffs :
Repair Permission & Rebuild Kext Caches
USING Kext Wizard
Terminal this command!
Always Have Perseverance