OK - maybe one mainly for UK users.
I have tried to use the lyr files OS have provided here GitHub - OrdnanceSurvey/OSMM-Topography-Layer-stylesheets: SQL scripts & cartographic stylesheets for OS MasterMap Topog…
Rendering a map of just the Topo Areas at 1:2500 takes over 10 seconds - and this is a a category break based on a single field - the numeric Style type.
If I replace the OS styles with a colour ramp, it is still slow.
If I apply single style, then re-apply the ArcMap random colours on the style_code it is again, fast.
If I then import the OS style into this fast layer - it is slow again! And stays slow if I apply a colour ramp.
However, if I do a ArcMap assigned random colors to the text field, style description, the map is drawn almost instantly
Indexing the fields doesn't seem to make any difference
If I apply the STYLES from the style type field to the Style Description, again it slows down.
The styles aren't complex, the most complex are a few graphics on a simple fill
Any UK users had similar and managed to get layer file that draws as quick as ArcMap assigned random colours?