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diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -2031,6 +2031,7 @@
'PhabricatorCacheSetupCheck' => 'applications/config/check/PhabricatorCacheSetupCheck.php',
'PhabricatorCacheSpec' => 'applications/cache/spec/PhabricatorCacheSpec.php',
'PhabricatorCacheTTLGarbageCollector' => 'applications/cache/garbagecollector/PhabricatorCacheTTLGarbageCollector.php',
+ 'PhabricatorCachedClassMapQuery' => 'applications/cache/PhabricatorCachedClassMapQuery.php',
'PhabricatorCaches' => 'applications/cache/PhabricatorCaches.php',
'PhabricatorCachesTestCase' => 'applications/cache/__tests__/PhabricatorCachesTestCase.php',
'PhabricatorCalendarApplication' => 'applications/calendar/application/PhabricatorCalendarApplication.php',
@@ -6889,6 +6890,7 @@
'PhabricatorCacheSetupCheck' => 'PhabricatorSetupCheck',
'PhabricatorCacheSpec' => 'Phobject',
'PhabricatorCacheTTLGarbageCollector' => 'PhabricatorGarbageCollector',
+ 'PhabricatorCachedClassMapQuery' => 'Phobject',
'PhabricatorCaches' => 'Phobject',
'PhabricatorCachesTestCase' => 'PhabricatorTestCase',
'PhabricatorCalendarApplication' => 'PhabricatorApplication',
diff --git a/src/applications/cache/PhabricatorCachedClassMapQuery.php b/src/applications/cache/PhabricatorCachedClassMapQuery.php
new file mode 100644
--- /dev/null
+++ b/src/applications/cache/PhabricatorCachedClassMapQuery.php
@@ -0,0 +1,129 @@
+<?php
+
+/**
+ * Cached @{class:PhutilClassMapQuery} which can perform lookups for single
+ * classes efficiently.
+ *
+ * Some class trees (like Conduit methods and PHID types) contain a huge number
+ * of classes but are frequently accessed by looking for a specific class by
+ * a known identifier (like a Conduit method name or a PHID type constant).
+ *
+ * Loading the entire class map for these cases has a small but measurable
+ * performance cost. Instead, we can build a cache from each Conduit method
+ * name to just the class required to serve that request. This means that we
+ * load fewer classes and have less overhead to execute API calls.
+ */
+final class PhabricatorCachedClassMapQuery
+ extends Phobject {
+
+ private $query;
+ private $queryCacheKey;
+ private $mapKeyMethod;
+ private $objectMap;
+
+ public function setClassMapQuery(PhutilClassMapQuery $query) {
+ $this->query = $query;
+ return $this;
+ }
+
+ public function setMapKeyMethod($method) {
+ $this->mapKeyMethod = $method;
+ return $this;
+ }
+
+ public function loadClasses(array $values) {
+ $cache = PhabricatorCaches::getRuntimeCache();
+
+ $cache_keys = $this->getCacheKeys($values);
+ $cache_map = $cache->getKeys($cache_keys);
+
+ $results = array();
+ $writes = array();
+ foreach ($cache_keys as $value => $cache_key) {
+ if (isset($cache_map[$cache_key])) {
+ $class_name = $cache_map[$cache_key];
+ try {
+ $result = $this->newObject($class_name);
+ if ($this->getObjectMapKey($result) === $value) {
+ $results[$value] = $result;
+ continue;
+ }
+ } catch (Exception $ex) {
+ // Keep going, we'll handle this immediately below.
+ }
+
+ // If we didn't "continue;" above, there was either a direct issue with
+ // the cache or the cached class did not generate the correct map key.
+ // Wipe the cache and pretend we missed.
+ $cache->deleteKey($cache_key);
+ }
+
+ if ($this->objectMap === null) {
+ $this->objectMap = $this->newObjectMap();
+ }
+
+ if (isset($this->objectMap[$value])) {
+ $results[$value] = $this->objectMap[$value];
+ $writes[$cache_key] = get_class($results[$value]);
+ }
+ }
+
+ if ($writes) {
+ $cache->setKeys($writes);
+ }
+
+ return $results;
+ }
+
+ public function loadClass($value) {
+ $result = $this->loadClasses(array($value));
+ return idx($result, $value);
+ }
+
+ private function getCacheKeys(array $values) {
+ if ($this->queryCacheKey === null) {
+ $this->queryCacheKey = $this->query->getCacheKey();
+ }
+
+ $key = $this->queryCacheKey;
+ $method = $this->mapKeyMethod;
+
+ $keys = array();
+ foreach ($values as $value) {
+ $keys[$value] = "classmap({$key}).{$method}({$value})";
+ }
+
+ return $keys;
+ }
+
+ private function newObject($class_name) {
+ return newv($class_name, array());
+ }
+
+ private function newObjectMap() {
+ $map = $this->query->execute();
+
+ $result = array();
+ foreach ($map as $object) {
+ $value = $this->getObjectMapKey($object);
+ if (isset($result[$value])) {
+ $other = $result[$value];
+ throw new Exception(
+ pht(
+ 'Two objects (of classes "%s" and "%s") generate the same map '.
+ 'value ("%s"). Each object must generate a unique map value.',
+ get_class($object),
+ get_class($other),
+ $value));
+ }
+ $result[$value] = $object;
+ }
+
+ return $result;
+ }
+
+ private function getObjectMapKey($object) {
+ return call_user_func(array($object, $this->mapKeyMethod));
+ }
+
+}

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