Yes, I'm seeing the same. I justed tested it in 18.1.4.
NR in Color page: 14 seconds.
NR in Edit page: 34 seconds.
When the NR is on the Edit page, is that NR before or after the Color page nodes?
Anyway, on the Color page I tested two node sequences: First NR node, then color node -- as well as: First color node, then NR node. Either sequence ran in 14 seconds. So the order of the elements doesn't seem to be the problem.