Heavy drops on ssd speeds after a second

[btryons]

Okay so ı own my pc for about 5 months my ssd was nearly always (ı dont remember properly but ı think the editing wasnt that bad before) full its Toshiba rc500 500gb it was nearly always at 50-80gb free space and when ı copy stuff it was nearly always down from that 50gb range my speeds usally looks like thay dropping of a cliff and go around 80-120mps per second but at crystalmark it shows his advertised speeds like not like before it sucks at cutting/editting its really slow it takes around a hour to cut a 7hrs video to half i dont know if its normal bit its too long for me

 

Please help drivers are uptaded (windows says so)

 

 

[Chabax]

SSD needs  empty space to keep speeds

[btryons]

1 minute ago, Chabax said:

SSD needs  empty space to keep speeds

ı have about %10 empty do ı need more than that?

[Chabax]

2 minutes ago, btryons said:

ı have about %10 empty do ı need more than that?

definatly, 15-20%

[btryons]

29 minutes ago, Chabax said:

definatly, 15-20%

now ı have about 109gb's but still same