I’ve had issues with blueprint spewing thousands of lines per second into my log (Wire trace not injected before jump? - Blueprint Visual Scripting - Unreal Engine Forums), so I think that I probably have more entries than you
That said, I have found in general that Slate will spend inordinate amounts of render cycle time in drawing large amounts of data. It might be the GPUs we have in the studio, since unfortunately the machines are built for VFX software which as strange as it sounds is almost at odds with a game engine, since they tend to use workstation class cards instead of gaming cards. The machines are quite strong except for that.
Intel Xeon E5-1650v2 @3.5ghz (12 cores)
NVidia Quadro K4000