One factor might be the format and resolution of your video. What device is this video from and what format and resolution is it? If it's not a format or codec that's easily assimilated, it can bog things down. As can certain effects.

You can also try setting your Preview window's quality level to a lower or Auto level to see if that makes a difference.

It is a video recorded with obs and it is 1920x1080 at 60 fps. I also have set the preview quality to draft, half

I'm not sure what specs OBS is using to compress your videos.

Open your OBS video in the free download MediaInfo. In MediaInfo set View to Text and then copy the complete text of this report and post it to this forum. With this detailed report we can more likely tell what's going on.

I'm assuming that if you start a new project and add only a dozen photos to it you don't experience any lag. This is a good indicator that the lag has to do with your source video rather than the program itself.

@Mashbanana
Which exact driversnumber is installed for your Nvidia GPU?

I'm not sure what specs OBS is using to compress your videos.

Open your OBS video in the free download MediaInfo. In MediaInfo set View to Text and then copy the complete text of this report and post it to this forum. With this detailed report we can more likely tell what's going on.

I'm assuming that if you start a new project and add only a dozen photos to it you don't experience any lag. This is a good indicator that the lag has to do with your source video rather than the program itself.

General
Complete name                            : C:\Users\(my pc name)\Videos\OBS\2021-10-31 11-01-37.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 1.42 GiB
Duration                                 : 5 min 20 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 38.1 Mb/s
Writing application                      : Lavf58.29.100

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4.2
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 5 min 20 s
Bit rate mode                            : Variable
Bit rate                                 : 38.0 Mb/s
Maximum bit rate                         : 40.0 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 60.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.305
Stream size                              : 1.42 GiB (100%)
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 5 min 20 s
Bit rate mode                            : Variable
Bit rate                                 : 121 kb/s
Maximum bit rate                         : 192 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 4.63 MiB (0%)
Title                                    : simple_aac_recording
Default                                  : Yes
Alternate group                          : 1

@Mashbanana
Which exact driversnumber is installed for your Nvidia GPU?

Not sure if this is the right thing, but it is 496.49

@Mashbanana
Which exact driversnumber is installed for your Nvidia GPU?

Not sure if this is the right thing, but it is 496.49

Tthe best for the job in VPro 17 with the Nvidia GTX 1660 super is the Studio driver 472.39

@Mashbanana
Which exact driversnumber is installed for your Nvidia GPU?

Not sure if this is the right thing, but it is 496.49

Tthe best for the job in VPro 17 with the Nvidia GTX 1660 super is the Studio driver 472.39

The main thing I use my PC for is gaming and then video editing is the 2nd thing

Than stay with yours, but the reason for your lag I have no further ideas, sorry.
BTW what is your buildnr. of your VMS Pl 17?

Than stay with yours, but the reason for your lag I have no further ideas, sorry.
BTW what is your buildnr. of your VMS Pl 17?

The build number is 223

Ok 👍 It is the latest.