I was reading a technical article and came across the "pun intended" part. I'm not sure what the pun is in this excerpt. What pun is intended in the sentence in bold?
Being at least 27 years old, DEFLATE is getting a bit long in the tooth. Computers are completely different today than they were in 1990. The Pentium microprocessor debuted in 1993. If memory serves (pun intended), it used PC66 DRAM, which had a transfer rate of 533 MB/s. For comparison, a modern NVMe M.2 SSD (like the Samsung 960 PRO) can read at 3000+ MB/s and write at 2000+ MB/s.