GTX 1080 FE slow speed for multiple sha1 hashes

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There's a drop to expect from multihash, but with 1 million hashes I think it's still OK. Here's my results using 3.20-rc1 on a stock clocked 1080FE:

$ ./hashcat hashes -a 3 ?b?b?b?b?b?b?b -w3 --speed-only -m 100 -d 1

1 hash:

Speed.Dev.#1.....: 8826.4 MH/s (76.01ms)

1,000,000 hashes:

Speed.Dev.#1.....: 6633.7 MH/s (101.14ms)