[FFmpeg-user] Slow speed when sub-clipping .mxf

[Media Mouth]

Been using FFmpeg to generate sub-clips, it's working perfectly, to the frame

One issue: The deeper into the source clip the start time is, the longer the seek-time is.
For long clips it can be a little exasperating.
Perhaps there's no way around this, but in the hopes there is some command/approach that makes for speedier seek times, here's the code  currently in use.

ffmpeg -i srcPath.mxf -ss startSecs -t outputDuration -timecode stmptTc -c copy destPath.mxf

Thanks