x64 fractserv test

project: 64-bit test.frp
server: eng-wzengerle64 running 64-bit version of fractserv, verified x64 native, all cores 100%
record, all frames empty with nearly identical coords, server Progress checked
server render times:

83.068
83.551
84.411
84.393
84.131
84.420
84.337

32-bit fractserv, also on eng-wzengerle64, verified x32 server render times:

84.572
87.800
83.241
84.129
82.974
83.261
83.002

Incredible, but for GMP 4.2, x64 appears to confer essentially NO advantage. WTF?