Need some help in speeding up my Mac Pro Mid-2012. The model is Model MacPro5,1 @ 3.2Ghz. I replaced the main hard drive from factory to a Samsung EVO 1TB. I have 20GB's of RAM and upgraded the display to a Radeon RX 580 8 GB. The computer still runs pretty slow IMO. It can take 10+ seconds to open some programs. I know it's a bit old, so I do even know if can hit the SATA III speeds. It shows on specs that the link transfer rate (across all hard drives, I still have the old non SSD hard drives as alternative disks) is a 3 GB link rate. I tested the disk write/read speed with Black Magic, and it's reading and writing around 250MB/sec. Any ideas on what else I can do to speed up the computer?