diff --git a/builds/4chan-X.user.js b/builds/4chan-X.user.js
index 8fdcc0ace..84e2e89a3 100644
--- a/builds/4chan-X.user.js
+++ b/builds/4chan-X.user.js
@@ -9010,15 +9010,19 @@
       }
     },
     setInterval: function() {
-      var cur, i, j;
+      var cur, i, j, limit;
 
-      i = ThreadUpdater.interval;
-      j = (cur = ThreadUpdater.outdateCount < 10) ? cur : 10;
-      if (!d.hidden) {
-        j = j < 7 ? j : 7;
+      i = ThreadUpdater.interval + 1;
+      if (Conf['Optional Increase']) {
+        cur = ThreadUpdater.outdateCount || 1;
+        limit = d.hidden ? 7 : 10;
+        j = cur <= limit ? cur : limit;
+        cur = ((i * 0.1).floor() || 1) * j * j;
+        ThreadUpdater.seconds = cur > i ? cur <= 300 ? cur : 300 : i;
+      } else {
+        ThreadUpdater.seconds = i;
       }
-      ThreadUpdater.seconds = Conf['Optional Increase'] ? (cur = [0, 5, 10, 15, 20, 30, 60, 90, 120, 240, 300][j] > i) ? cur : i : i;
-      ThreadUpdater.set('timer', ThreadUpdater.seconds++);
+      ThreadUpdater.set('timer', ThreadUpdater.seconds);
       return ThreadUpdater.count(true);
     },
     intervalShortcut: function() {
diff --git a/builds/crx/script.js b/builds/crx/script.js
index ce225ef1f..92bc2dc4a 100644
--- a/builds/crx/script.js
+++ b/builds/crx/script.js
@@ -8995,15 +8995,19 @@
       }
     },
     setInterval: function() {
-      var cur, i, j;
+      var cur, i, j, limit;
 
-      i = ThreadUpdater.interval;
-      j = (cur = ThreadUpdater.outdateCount < 10) ? cur : 10;
-      if (!d.hidden) {
-        j = j < 7 ? j : 7;
+      i = ThreadUpdater.interval + 1;
+      if (Conf['Optional Increase']) {
+        cur = ThreadUpdater.outdateCount || 1;
+        limit = d.hidden ? 7 : 10;
+        j = cur <= limit ? cur : limit;
+        cur = ((i * 0.1).floor() || 1) * j * j;
+        ThreadUpdater.seconds = cur > i ? cur <= 300 ? cur : 300 : i;
+      } else {
+        ThreadUpdater.seconds = i;
       }
-      ThreadUpdater.seconds = Conf['Optional Increase'] ? (cur = [0, 5, 10, 15, 20, 30, 60, 90, 120, 240, 300][j] > i) ? cur : i : i;
-      ThreadUpdater.set('timer', ThreadUpdater.seconds++);
+      ThreadUpdater.set('timer', ThreadUpdater.seconds);
       return ThreadUpdater.count(true);
     },
     intervalShortcut: function() {
diff --git a/src/Monitoring/ThreadUpdater.coffee b/src/Monitoring/ThreadUpdater.coffee
index 2bb8b9549..ff7e5ab01 100755
--- a/src/Monitoring/ThreadUpdater.coffee
+++ b/src/Monitoring/ThreadUpdater.coffee
@@ -148,18 +148,28 @@ ThreadUpdater =
         ThreadUpdater.cb.checkpost()
 
   setInterval: ->
-    i = ThreadUpdater.interval
-    # Math.min/max is provably slow: http://jsperf.com/math-s-min-max-vs-homemade/5
-    j = if cur = ThreadUpdater.outdateCount < 10 then cur else 10
-    unless d.hidden
+    i   = ThreadUpdater.interval + 1
+    
+    if Conf['Optional Increase']
       # Lower the max refresh rate limit on visible tabs.
-      j = if j < 7 then j else 7
-    ThreadUpdater.seconds =
-      if Conf['Optional Increase']
-        if cur = [0, 5, 10, 15, 20, 30, 60, 90, 120, 240, 300][j] > i then cur else i
-      else
-        i
-    ThreadUpdater.set 'timer', ThreadUpdater.seconds++
+      cur   = ThreadUpdater.outdateCount or 1
+      limit = if d.hidden then 7 else 10
+      j     = if cur <= limit then cur else limit
+
+      # 1 second to 100, 30 to 300.
+      cur = ((i * 0.1).floor() or 1) * j * j
+      ThreadUpdater.seconds =
+        if cur > i
+          if cur <= 300
+            cur
+          else
+            300
+        else
+          i
+    else
+      ThreadUpdater.seconds = i
+
+    ThreadUpdater.set 'timer', ThreadUpdater.seconds
     ThreadUpdater.count true
 
   intervalShortcut: ->