As mentioned in T86622, having Filmic set as default View Transform setting, will for most VSE users result in a 6 minutes export will take a whooping 26 minutes and the resulting colors will be flat/greyed out.
As I do not think it is fair to users to let Blender continuously be released with a destructive setting like that, here is a quick fix which can be used in 2.93 until @brecht decides what to do about this problem.
This hack piggybacks the Use Frame Rate import setting, which will copy the fps of the first imported Movie strip to the Render Properties. This hack does the same for the View Transform setting by setting it to standard when the first strip Movie strip is imported.
As mentioned I hope Brecht comes up with something better, if nothing else, this patch can be seen as the dreadful alternative, if nothing else is done about this problem.
Code is copy-pasted from versioning code.
I will not do revisions of this code, so if you guys need changes, you are free to do so.
Good luck.