Help! Garage Band latency + "disk too slow"


Hoping someone can help! I'm currently having issues with latency in Garage Band.

From the start of a recording session, I'll get around 2 seconds worth of delay between when I play guitar and when I hear the playback. Sometimes when I press the "record" button it'll correct this and the delay will be gone, but only for a minute or so, then the delay returns.

Also, occasionally I'll have the recording stop entirely and an error message will pop up: "Disk too slow"

I am using a twelve year old interface (Edirol FA-66)...
connected via firewire/thunderbolt adapter....
so I'm suspicious it might be that.

MacBook Pro (Retina, 13-inch, Early 2015)
Processor: 2.7 GHz Intel Core i5
Memory: 8 GB 1867 MHz DDR3
Graphics: Intel Iris Graphics 6100 1536 MB
(78GB of available space)
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