diff --git a/VARIABLES.md b/VARIABLES.md
index 57d854c..2ef0cdf 100644
--- a/VARIABLES.md
+++ b/VARIABLES.md
@@ -50,6 +50,7 @@ If both whitelisting and blacklisting are set, only the whitelisting will be act
 * `Instance:SensitiveTwitterAccounts` (default: null) mark all media from given accounts as sensitive by default, separated by `;`. 
 * `Instance:FailingTwitterUserCleanUpThreshold` (default: 700) set the max allowed errors (due to a banned/deleted/private account) from a Twitter Account retrieval before auto-removal. (by default an account is called every 15 mins)
 * `Instance:FailingFollowerCleanUpThreshold` (default: 30000) set the max allowed errors from a Follower (Fediverse) Account before auto-removal. (often due to account suppression, instance issues, etc)
+* `Instance:UserCacheCapacity` (default: 10000) set the caching limit of the Twitter User retrieval. Must be higher than the number of synchronized accounts on the instance.
 
 # Docker Compose full example
 
diff --git a/src/BirdsiteLive.Common/Settings/InstanceSettings.cs b/src/BirdsiteLive.Common/Settings/InstanceSettings.cs
index eb77d1f..0f701ff 100644
--- a/src/BirdsiteLive.Common/Settings/InstanceSettings.cs
+++ b/src/BirdsiteLive.Common/Settings/InstanceSettings.cs
@@ -14,5 +14,7 @@
 
         public int FailingTwitterUserCleanUpThreshold { get; set; }
         public int FailingFollowerCleanUpThreshold { get; set; } = -1;
+
+        public int UserCacheCapacity { get; set; }
     }
 }
diff --git a/src/BirdsiteLive.Twitter/CachedTwitterService.cs b/src/BirdsiteLive.Twitter/CachedTwitterService.cs
index ac20a62..ef5b0e5 100644
--- a/src/BirdsiteLive.Twitter/CachedTwitterService.cs
+++ b/src/BirdsiteLive.Twitter/CachedTwitterService.cs
@@ -1,4 +1,5 @@
 using System;
+using BirdsiteLive.Common.Settings;
 using BirdsiteLive.Twitter.Models;
 using Microsoft.Extensions.Caching.Memory;
 
@@ -13,11 +14,8 @@ namespace BirdsiteLive.Twitter
     {
         private readonly ITwitterUserService _twitterService;
 
-        private MemoryCache _userCache = new MemoryCache(new MemoryCacheOptions()
-        {
-            SizeLimit = 5000
-        });
-        private MemoryCacheEntryOptions _cacheEntryOptions = new MemoryCacheEntryOptions()
+        private readonly MemoryCache _userCache;
+        private readonly MemoryCacheEntryOptions _cacheEntryOptions = new MemoryCacheEntryOptions()
             .SetSize(1)//Size amount
             //Priority on removing when reaching size limit (memory pressure)
             .SetPriority(CacheItemPriority.High)
@@ -27,9 +25,14 @@ namespace BirdsiteLive.Twitter
             .SetAbsoluteExpiration(TimeSpan.FromDays(7));
 
         #region Ctor
-        public CachedTwitterUserService(ITwitterUserService twitterService)
+        public CachedTwitterUserService(ITwitterUserService twitterService, InstanceSettings settings)
         {
             _twitterService = twitterService;
+
+            _userCache = new MemoryCache(new MemoryCacheOptions()
+            {
+                SizeLimit = settings.UserCacheCapacity
+            });
         }
         #endregion
 
diff --git a/src/BirdsiteLive/appsettings.json b/src/BirdsiteLive/appsettings.json
index b49d25c..4cee8ba 100644
--- a/src/BirdsiteLive/appsettings.json
+++ b/src/BirdsiteLive/appsettings.json
@@ -24,7 +24,8 @@
     "UnlistedTwitterAccounts": null,
     "SensitiveTwitterAccounts": null,
     "FailingTwitterUserCleanUpThreshold": 700,
-    "FailingFollowerCleanUpThreshold": 30000 
+    "FailingFollowerCleanUpThreshold": 30000,
+    "UserCacheCapacity": 10000 
   },
   "Db": {
     "Type": "postgres",