Performance Regression in frame_methods.Equals.time_frame_float_equal
https://pandas.pydata.org/speed/pandas/index.html#frame_methods.Equals.time_frame_float_equal?commits=77f4a4d673e2d2b3f7396a94818771d332bd913c

Some discussion starting at https://github.com/pandas-dev/pandas/pull/34962#issuecomment-655456601

@jbrockmendel what needs to be done for 1.1, just optimize `array_equivalent` or something larger? Is this a blocker (if so can you  add the blocker tag)?