I’ve had issues with blueprint spewing thousands of lines per second into my log (Wire trace not injected before jump? - Blueprint - Epic Developer Community 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)
64GB RAM
NVidia Quadro K4000
Windows 7x64