4K video with adjustment clip effect not playing smoothly

I have a video clip, it's BRAW 4K, and when I add an Adjustment Clip over it and add the DSLR effect to the Adjustment Clip, it struggles to play.
I want the video clip to be monochrome so I did this using the color page. But I don't want the effect to be monochrome because I like the color of the red REC dot being red.
If I don't use an Adjustment Clip and just place the DSLR effect on the video clip then the red dot becomes monochrome which is what I don't want.
How can I make it play smoothly keeping the red REC dot red?
I really like what Blackmagic have done with this DSLR effect and I'm going to use it for an up-and-coming film.
I want the video clip to be monochrome so I did this using the color page. But I don't want the effect to be monochrome because I like the color of the red REC dot being red.
If I don't use an Adjustment Clip and just place the DSLR effect on the video clip then the red dot becomes monochrome which is what I don't want.
How can I make it play smoothly keeping the red REC dot red?
I really like what Blackmagic have done with this DSLR effect and I'm going to use it for an up-and-coming film.