Even at 5x5 it causes a noticeable stutter when the game is loading more chunks. This is more noticeable on low view distances, where walking a few blocks will induce stutter.
I tested the same configuration on version 1.13.2 (with no mods) and the problem does not occur. Even at 15x15 biome blend there is no stutter, be at view distance 2 or 32.
Perhaps unrelated, but the same kind of stuttering (like a fraction of a second) also happens when placing or removing torches, maybe the problem has to do with updating individual blocks?
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Who can confirm fix?

This should be reopened.
I can confirm this is not fixed in Experimental Snapshot 6. I am seeing extreme lag spikes occasionally when placing/breaking blocks. I do not suspect this is a performance issue with my PC as I am able to play smoothly with very high settings typically but when this issue is present, even after turning render distance, smooth lighting, and graphics down to minimum settings I am still seeing consistent spikes. It seems to appear for short periods of time and then disappear randomly.
I have noted that when the issue is present, it immediately disappears when I turn biome blend off and immediately reappears when I turn it back on.
Confirmed for 19w41a.