Gets laggy with filters

i have a problem … when i open a file … a video and bring it to the software it works at its normal speed but when i apply rotate and scale filter to zoom in a little bit the video goes in slow motion even the color grading filter does the same … basically any filter … when i remove filter it goes back to normal … so how do i fix this please i want to zoon in in the videos without being in slow motion

Hi Ahmed_Mahdy
I do have the same problem. But I know the reason in my case : My computer is too old and slow to handle HD files editing. The playback will appear slower when I put filters, transitions, effects etc… Exported files are OK though. You don’t mention your computer specs, so maybe you should first look at the minimum requirements section of the FAQ page :

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