diff --git a/app/lib/feed_manager.rb b/app/lib/feed_manager.rb
index b6b5fd729d..9c5c306e96 100644
--- a/app/lib/feed_manager.rb
+++ b/app/lib/feed_manager.rb
@@ -32,6 +32,15 @@ class FeedManager
     "feed:#{type}:#{id}:#{subtype}"
   end
 
+  # The number of items in the given timeline
+  # @param [Symbol] type
+  # @param [Integer] id
+  # @param [Symbol] subtype
+  # @return [Integer]
+  def timeline_size(type, id, subtype = nil)
+    redis.zcard(key(type, id, subtype))
+  end
+
   # The filter result of the status to a particular feed
   # @param [Symbol] timeline_type
   # @param [Status] status
diff --git a/app/services/precompute_feed_service.rb b/app/services/precompute_feed_service.rb
index 86aad50983..a591c90913 100644
--- a/app/services/precompute_feed_service.rb
+++ b/app/services/precompute_feed_service.rb
@@ -3,13 +3,21 @@
 class PrecomputeFeedService < BaseService
   include Redisable
 
-  def call(account)
-    FeedManager.instance.populate_home(account)
+  def call(account, skip_filled_timelines: false)
+    @skip_filled_timelines = skip_filled_timelines
+
+    FeedManager.instance.populate_home(account) unless skip_timeline?(:home, account.id)
 
     account.owned_lists.each do |list|
-      FeedManager.instance.populate_list(list)
+      FeedManager.instance.populate_list(list) unless skip_timeline?(:list, list.id)
     end
   ensure
     redis.del("account:#{account.id}:regeneration")
   end
+
+  private
+
+  def skip_timeline?(type, id)
+    @skip_filled_timelines && FeedManager.instance.timeline_size(type, id) * 2 > FeedManager::MAX_ITEMS
+  end
 end
diff --git a/lib/mastodon/cli/feeds.rb b/lib/mastodon/cli/feeds.rb
index 3879751d0e..324e493e28 100644
--- a/lib/mastodon/cli/feeds.rb
+++ b/lib/mastodon/cli/feeds.rb
@@ -11,17 +11,21 @@ module Mastodon::CLI
     option :concurrency, type: :numeric, default: 5, aliases: [:c]
     option :verbose, type: :boolean, aliases: [:v]
     option :dry_run, type: :boolean, default: false
+    option :skip_filled_timelines
     desc 'build [USERNAME]', 'Build home and list feeds for one or all users'
     long_desc <<-LONG_DESC
       Build home and list feeds that are stored in Redis from the database.
 
+      With the --skip-filled-timelines, timelines which contain more than half
+      the maximum number of posts will be skipped.
+
       With the --all option, all active users will be processed.
       Otherwise, a single user specified by USERNAME.
     LONG_DESC
     def build(username = nil)
       if options[:all] || username.nil?
         processed, = parallelize_with_progress(active_user_accounts) do |account|
-          PrecomputeFeedService.new.call(account) unless dry_run?
+          PrecomputeFeedService.new.call(account, skip_filled_timelines: options[:skip_filled_timelines]) unless dry_run?
         end
 
         say("Regenerated feeds for #{processed} accounts #{dry_run_mode_suffix}", :green, true)
@@ -30,7 +34,7 @@ module Mastodon::CLI
 
         fail_with_message 'No such account' if account.nil?
 
-        PrecomputeFeedService.new.call(account) unless dry_run?
+        PrecomputeFeedService.new.call(account, skip_filled_timelines: options[:skip_filled_timelines]) unless dry_run?
 
         say("OK #{dry_run_mode_suffix}", :green, true)
       else