So I have an ancient MacBookPro, and plugged in an Intel 300G SSD to it. Writing the same 1GB file, to 100 files gives me:
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ZFS:
1073741824 bytes transferred in 29.548205 secs (36338648 bytes/sec)
1073741824 bytes transferred in 31.414408 secs (34179916 bytes/sec)
1073741824 bytes transferred in 45.366121 secs (23668363 bytes/sec)
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HFS:
1073741824 bytes transferred in 27.987088 secs (38365614 bytes/sec)
1073741824 bytes transferred in 27.594821 secs (38910991 bytes/sec)
1073741824 bytes transferred in 27.506261 secs (39036270 bytes/sec)
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1073741824 bytes transferred in 27.863579 secs (38535675 bytes/sec)
Looks like we can match HFS quite often, but ZFS has a lot of variation, highest at 45s.
Is this what people means when we talk about "poor performance" ? Is write speed the worst? Or read speed? Listing?