A quick google search shows that RPi Zero is a cheap $10 board. I have what I guess is a Pi 4. It has an Ethernet connection, HDMI connection to my monitor, USB for keyboard and mouse. Nothing slow about it at all! By the time I bought my Pi, the case. power supply. and the cables, it was north of $80. A friend burned me an SD card for me with the O/S including Perl and Python. My Pi has a Debian flavor of Unix and it works great - very fast - no problems.