diff --git a/code/data_cache.js b/code/data_cache.js
index e6caf3b9..4002a937 100644
--- a/code/data_cache.js
+++ b/code/data_cache.js
@@ -2,15 +2,9 @@
 // cache for map data tiles. 
 
 window.DataCache = function() {
-  // stock site nemesis.dashboard.DataManager.CACHE_EXPIRY_MS_ = 18E4 - so should be 2 mins cache time
-  this.REQUEST_CACHE_FRESH_AGE = 120;  // if younger than this, use data in the cache rather than fetching from the server
+  // stock site nemesis.dashboard.DataManager.CACHE_EXPIRY_MS_ = 18E4 - 3 minutes
+  this.REQUEST_CACHE_FRESH_AGE = 3*60;  // if younger than this, use data in the cache rather than fetching from the server
 
-  // stale cache entries can be updated (that's what the optional 'timestampMs' field in getThinnedEntities is
-  // for, retrieving deltas) so use a long max age to take advantage of this
-  // however, there must be an overall limit on the maximum age of data from the servers, otherwise the deletedEntity
-  // entries would grow indefinitely. an hour seems reasonable from experience with the data, so 55 mins max cache time
-//  this.REQUEST_CACHE_MAX_AGE = 55*60;  // maximum cache age. entries are deleted from the cache after this time
-//UPDATE: this timestampMs parameter doesn't work, so reduced max age to limit RAM usage
   this.REQUEST_CACHE_MAX_AGE = 15*60;  // maximum cache age. entries are deleted from the cache after this time
 
   if (L.Browser.mobile) {