My guess is that nobody else is experiencing this issue as I'm seeing no
other posts about this.

When I navigate by links with K or shift K in Thunderbird and even, to
an extent, in Chrome I notice a slight slowdown in responsiveness
compared to 2018.3. For a short time I thought it was my computer as I
was sometimes seeing this occur in 2018.3.2 but, in general, 2018.3.2 is
still somewhat faster. I sent Quentin a debug file with all addons
disabled but I'm assuming there was nothing obvious in the output as I
haven't heard back. I notice this with Espeak. On a faster machine I do
not notice this but on a slower Athlon 2.9 GHZ there is a slight but
noticeable difference. Just wondering if anybody has noticed this and if
something changed in the code regarding navigation?

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David Goldfield, Assistive Technology Specialist WWW.David-Goldfield.Com