iMac 10,1 allegedly does not support nvram, and takes longer than usual to boot. What could be the issue?

Command+Option+P+R does nothing, and executing

-xp

and

-c

returns the same

is not supported on this system

This is on a clean install of Yosemite (installation of El Cap and above fails every time), on a SATA internal SSD. Edit: The underlying issue I'm trying to fix is slow boot times. Yosemite is installed on an SSD, yet it still takes about 2 minutes and 20 seconds to boot up. I've recorded a video of it booting up in verbose mode, but I've yet to decide whether to upload that or try to get a text dump of the console. Edit 2: Watch the iMac boot in real-time, with verbose output: https://streamable.com/9fa6h6 Edit 3: Output of

-p IODeviceTree

https://pastebin.com/BGJvkYea Edit 4: Boot ROM is

.00CC.B00

and SMC version (system) is

.53f13

. There is nothing in

/System/Library/CoreServices/Firmware Updates/

. Any chance that something like this (https://www.reddit.com/r/hackintosh/comments/adxdb0/the_bodgers_guide_to_getting_nvram_working/) can fix it, partially or otherwise?