[AbRASiON]

http://kodi.wiki/view/HOW-TO%3AModify_the_video_cache

<advancedsettings>
<network>
<cachemembuffersize>62914560</cachemembuffersize>
</network>
<videolibrary>
<cleanonupdate>true</cleanonupdate>
</videolibrary>
<videodatabase>
<type>mysql</type>
<host>HTPC</host>
<port>3306</port>
<user>xbmc</user>
<pass>xbmc</pass>
</videodatabase>
<musicdatabase>
<type>mysql</type>
<host>HTPC</host>
<port>3306</port>
<user>xbmc</user>
<pass>xbmc</pass>
</musicdatabase>
<videoextensions>
<add>.webm</add>
<add>.ogm</add>
<add>.ts</add>
<add>.m4v</add>
<remove></remove>
</videoextensions>
<pathsubstitution>
<substitute>
<from>special://masterprofile/sources.xml</from>
<to>SMB://XXXUSERXXX:XXXMYPASSXXX@HTPC/C$/Users/xbmc/AppData/Roaming/Kodi/userdata/sources.xml</to>
</substitute>
</pathsubstitution>
</advancedsettings>

I'm curious what else I might need to change?
(The two I've highlighted are now of course "cache" and "memorysize" - I only found this accidentally)

[trogggy]

No. Kodi never touches advancedsettings.xml other than to read it at startup or on profile load.
You need to make any changes (eg cache settings) manually.
Edit: fwiw I can't see anything in the above other than cachemembuffersize that's changed.

[AbRASiON]

So I'm guessing that I would have needed to pay close attention to the release notes to notice this one basically?

I upgraded and found issues from 15.2 -> 17.3

[trogggy]

I guess so. The wiki advancedsettings entry will usually have any changes, or sticking 'advancedsettings.xml' in the search box here should flag them up.

[PatK]

Note changes section 3

In Kodi v17, the cache-related tags were removed from <network> and placed under a new <cache> tag. In addition, the following tags were renamed:

<cachemembuffersize> was renamed to <memorysize>
<readbufferfactor> is renamed to <readfactor>