VIDEO LAGS 5 SEC IF SEEK BACK FORTH IN YOUTUBE

VIDEO ALSO POSTED,,,,,, I NEED 4K60FPS WITHOUT SEEK LAG,, HERES THE PROBLEM I AM FACING (PROBLEM VIDEO LINK IS ALSO GIVEN) ... I SEEK ONE VIDEO BACK AND FORTH IT INSTANTLY PLAYS BUT IN MY CHANNEL 1 VIDEO ( THANOS POWERSHOW) WHEN I SEEK FORWARD OR BACKWARD IT LAGS FOR 4-5 SEC AND ONE MORE THING IN STATS FOR NERD THAT CHANNEL BUFFERING HEALTH IS FULL YELLOW/GREEN MEANS VERY GOOD MY BUFFER HEALTH VERY BAD, ITS A VERY WEIRD ERROR I HAVE PREMEIRE 20 TO 26 ... OR THIS ISSUE OF KEYFRAME ?? OR hlg ? AS IN EXPORT WINDOW OUTPUT FILE ITS REC709 AND IT SHOWS HLG100 ALSO, PLS GUIDE IN DETAISL I CAN SEEK ON THAT GOOD VIDEO INSTANT AS MY INTERNET IS NOT THE CULPRIT, OR ANY 4K60FPS INSTANT PLAY IF I FAST FORWARD OR BACK BUT IN MY VIDEO IT LAGS 4 SEC, PLS HELP, I EXPORT IN 4K60FPS CBR 80 MAX RES MAX DEPTH REC709 AND HLG100 ALSO SHOWS THERE, MADAD KIJIYE