Editing is EXTREMELY slow

TGVoid Website User Posts: 4

Hello! I was in the process of editing a video and I realized that changing the point of video has a high amount of latency.

I am using a .mp4 file remuxed from a .mkv file using OBS Studio. Here are my specs:


AMD A10-5800K 3.8 GHz 4c/4t


8 GB of DDR3 Ram

32 GB SSD Cache

500 GB internal HDD for OS

1 TB Western Digital HDD via USB 3.0 (where video files and Hitfilm is on)


Thanks for your time!


  • Yeremyah
    Yeremyah Website User Posts: 995 Enthusiast

    Your CPU will be a bottleneck I believe?

  • Triem23
    Triem23 Moderator Moderator, Website User, Ambassador, Imerge Beta Tester, HitFilm Beta Tester Posts: 19,798 Ambassador

    CPU is fine. It's roughly equal to an i5 6600k.

    Nvidia 1050 is a pretty good GPU..

    I can see two possible bottlenecks. First, your OBS encode settings are probably giving you a highly compressed, high-overhead file. Best way to check that is to download Mediainfo and paste in its report of a video file. 

    Second possible bottleneck is the external drive. In theory USB3 is fast enough, but peak speed isn't the same as sustained. 

    Finally, Hitfilm IS slower than some of it's competitors at video decode, but this ties back to the OBS encode. 

    Take a look at this video from about 17:30 to about 29:00 (on a PC/Mac, click the blue time codes in the description to skip around). First bit covers MediaInfo, second goes over transcoding with Handbrake, but gives tested and Hitfilm optimized settings you should be able to adapt for OBS. 

  • Yeremyah
    Yeremyah Website User Posts: 995 Enthusiast
    edited June 2017
  • Triem23
    Triem23 Moderator Moderator, Website User, Ambassador, Imerge Beta Tester, HitFilm Beta Tester Posts: 19,798 Ambassador

    @Yeremyah benchmarks are imprecise, but I went with this comparison. 


    So, not a top end processor, but certainly well over minimum spec. 

  • TGVoid
    TGVoid Website User Posts: 4

    I'm sorry for the late reply. I just built a new rig a few days ago.

    CPU: AMD Ryzen 5 1600

    GPU: Zotac GTX 1050 2 GB

    RAM: Corsair Vengeance LPX 3000 MHz


    I edited a 720p30 video yesterday off my HDD and it worked well. However, when I edit in 60 FPS, there is a noticeable amount of lag when I am moving to different points in the video. It takes 10-30 seconds to fully load before I can edit again. I did transcode the video with Handbrake and moved my video to an SSD, which helped a bit, but didn't solve the issue. I also noticed that only 4-6 of the 12 threads available are being utilized while editing, and the total CPU usage maxes out to 14%. Is this normal?


    Thanks for the help!

  • iFang
    iFang Website User Posts: 20

    This was the best solution I got.

    Transcode the .mp4 video file into DNxHD codec (for up to 1080p 60fps) or DNxHR (for up to UHD or 4K). For more information, see this thread. https://hitfilm.com/forum/discussion/comment/88026/#Comment_88026

  • CleverTagline
    CleverTagline Moderator Las Vegas, NVModerator, Website User, Ambassador, HitFilm Beta Tester Posts: 3,305 Ambassador

    @TGVoid Not sure why editing 60fps footage would be causing such a lag.  There may be system issues, but I'm on a Mac, so I'll defer that analysis to others.  One general tip, though, would be to change the preview mode so that fewer (or no) thumbnails are shown for clips on the timeline.  Click the arrow next to the zoom slider and change Preview Mode to either Start/End or None.

    As for system performance with HitFilm, there has been a deep discussion on that in another thread that may be worth reviewing:


  • TGVoid
    TGVoid Website User Posts: 4

    I transcoded the source video through Handbrake a second time and the editing performance improved drastically. I'm not sure why the first transcode didn't give a great result, but my problem is fixed for now. Thanks for the help!

This discussion has been closed.