Cache variables in core._cache so that we can retrieve them all in a

single query.  In most cases, we were fetching 4-5 variables per page
load, so this is 2-3x faster.

core/views/admin_advanced_settings.html.php

@@ -17,6 +17,7 @@
       <th> <?= t("Value") ?></th>
     </tr>
     <? foreach ($vars as $var): ?>
+    <? if ($var->module_name == "core" && $var->name == "_cache") continue ?>
     <tr class="setting">
       <td> <?= $var->module_name ?> </td>
       <td> <?= $var->name ?> </td>