This redoes most of the documentation on optimizing Review Board,

renaming it to "Optimizing and Scaling Review Board."
The new version of the guide starts off by discussing the main choke

points for Review Board (database and memcached, repositories,

integrations, and auth backends).
It then goes into recommended hardware, replacing the old "Hardware"

section. This gives more modern, concrete recommendations for CPU, RAM,

and disk.
It then contains a new version of the formerly standalone "Optimizing

Memcached" page, which walks users through actually configuring new

settings for supported distros.
The next section is new: "Setting Diff Limits." This goes into how to

set a maximum diff size, maximum number of lines for syntax

highlighting, and the importance of having these defaults (including

touching upon the chance of user push-back on settings, and how to

address those).
The old "Multi-Server Strategy" section is now "Scaling Your

Deployment." It talks about scaling out the database, memcached, and web

servers as before, but in a bit more detail. A new "Load Balancer"

section has also been added.
And finally, a new "Troubleshooting Performance Problems" section, which

talks about the issues that can occur when large diffs are posted

without a limit, when repositories are slow, or when the system is

overloaded.
The old "Optimizing MySQL" page has been removed, as nothing in there

is really applicable anymore to modern versions of MySQL.

Built the docs and read through them. Checked for spelling errors,

bad links, and build issues.