Microsoft Corp. said on Tuesday the patches released to guard against the Meltdown and Spectre security threats slowed down some personal computers and servers, with systems running on older Intel Corp. processors seeing a noticeable decrease in performance.

The security updates also froze some computers running AMD chipsets, Microsoft said in a blog post, citing customer complaints.

Shares in Intel, which reiterated on Tuesday that it saw no sign of significant slowdown in computers, fell 1.4 percent, while those of AMD fell nearly 4 percent.