Originally posted by vonBaloney Your Highlight and/or Shadow corrections are probably turned on. I don't have a K-1 yet, but if it is like older models, they introduce a significant delay. (So turn them off.)
It has to be something like that.
Other things to consider...
Are you writing with jpegs and raw?
Quote: When shooting RAW files, buffer depths were much lower at 17 DNG RAW frames and 13 DNG RAW+JPEG frames before the camera slowed down.
Pentax K-1 Review - Performance
This is what I find to be the big drawback for wildlife...
Quote: Buffer clearing was quite slow, taking a glacial 48 seconds to clear a burst of 74 JPEGs, 31 seconds after a max-length burst of RAW files, and 34 seconds after a max-length RAW+JPEG burst, when tested with our 95MB/s SanDisk Extreme Pro UHS-I card.
Waiting 34 seconds for the buffer to clear with such a small buffer is an eternity. I find practically, with my set up, I get about 6 images at 4 FPS before clearing the buffer slows the camera down to a crawl. Just another reason, I still depend on my K-3 for birding.