PageSpeed Slow After Auto Update 6.3

Before the auto update to version 6.3, my sites scored high (97-99) on PageSpeed. Keep in mind that I use:

• a lightweight theme
• few plugins (Contact Form 7, SEO Framework, LiteSpeed Cache)

Ever since the update, PageSpeed is showing slower loading times (80-85).

I tried disabling the plugins, purging all, optimizing the database, but nothing seems to help.

Anyone else having this issue after updating to version 6.3?