Does not load chunks fast in 1.20.6

my 1.20.6 is not rendering distances all versions below 1.20.4 are is that a bug or is it my issue
 
 
 
while i run land is not rendered i fall down in void it takes time and while i use elytra it's just dark everywhere it just can't render fast at all i've changed hosts and tried it does not seem to be server or memory glitch happens to even high end pc