diff --git a/lib/sidekiq_unique_jobs/batch_delete.rb b/lib/sidekiq_unique_jobs/batch_delete.rb
index 350ee2521..ce44f2198 100644
--- a/lib/sidekiq_unique_jobs/batch_delete.rb
+++ b/lib/sidekiq_unique_jobs/batch_delete.rb
@@ -18,6 +18,7 @@ class BatchDelete
       PRIMED
       LOCKED
       INFO
+      SCORE
     ].freeze
 
     # includes "SidekiqUniqueJobs::Connection"
diff --git a/lib/sidekiq_unique_jobs/key.rb b/lib/sidekiq_unique_jobs/key.rb
index 296224f3a..90213aaba 100644
--- a/lib/sidekiq_unique_jobs/key.rb
+++ b/lib/sidekiq_unique_jobs/key.rb
@@ -37,6 +37,10 @@ class Key
     # @!attribute [r] expiring_digests
     #   @return [String] the zset with locked expiring_digests
     attr_reader :expiring_digests
+    #
+    # @!attribute [r] score
+    #   @return [String] score (timestamp) for the lock
+    attr_reader :score
 
     #
     # Initialize a new Key
@@ -49,6 +53,7 @@ def initialize(digest)
       @primed           = suffixed_key("PRIMED")
       @locked           = suffixed_key("LOCKED")
       @info             = suffixed_key("INFO")
+      @score            = suffixed_key("SCORE")
       @changelog        = CHANGELOGS
       @digests          = DIGESTS
       @expiring_digests = EXPIRING_DIGESTS
@@ -86,7 +91,7 @@ def ==(other)
     # @return [Array] an ordered array with all keys
     #
     def to_a
-      [digest, queued, primed, locked, info, changelog, digests, expiring_digests]
+      [digest, queued, primed, locked, info, changelog, digests, expiring_digests, score]
     end
 
     private
diff --git a/lib/sidekiq_unique_jobs/lock.rb b/lib/sidekiq_unique_jobs/lock.rb
index cfd2a6b8d..4a2dab042 100644
--- a/lib/sidekiq_unique_jobs/lock.rb
+++ b/lib/sidekiq_unique_jobs/lock.rb
@@ -73,6 +73,7 @@ def lock(job_id, lock_info = {}, score = nil)
           add_digest_to_set(pipeline, lock_info, score)
           pipeline.zadd(key.changelog, score, changelog_json(job_id, "queue.lua", "Queued"))
           pipeline.zadd(key.changelog, score, changelog_json(job_id, "lock.lua", "Locked"))
+          pipeline.set(key.score, now_f)
         end
       end
     end
@@ -129,7 +130,7 @@ def del
       redis do |conn|
         conn.multi do |pipeline|
           pipeline.zrem(DIGESTS, key.digest)
-          pipeline.del(key.digest, key.queued, key.primed, key.locked, key.info)
+          pipeline.del(key.digest, key.queued, key.primed, key.locked, key.info, key.score)
         end
       end
     end
@@ -264,6 +265,19 @@ def changelog
       @changelog ||= Changelog.new
     end
 
+    #
+    # The score for the lock
+    #
+    # @note Used to improve performance when deleting digests from
+    #   sorted sets, e.g. the schedule and retry sets.
+    #
+    #
+    # @return [Redis::String] a string representation of the key
+    #
+    def score
+      @score ||= Redis::String.new(key.score)
+    end
+
     #
     # A nicely formatted string with information about this lock
     #
@@ -280,6 +294,7 @@ def to_s
             primed_jids: #{primed_jids}
             locked_jids: #{locked_jids}
              changelogs: #{changelogs}
+                  score: #{score.value}
       MESSAGE
     end
 
diff --git a/lib/sidekiq_unique_jobs/locksmith.rb b/lib/sidekiq_unique_jobs/locksmith.rb
index 3f49619c3..7394395c4 100644
--- a/lib/sidekiq_unique_jobs/locksmith.rb
+++ b/lib/sidekiq_unique_jobs/locksmith.rb
@@ -230,6 +230,8 @@ def enqueue(conn)
       return unless validity >= 0 || config.pttl.zero?
 
       write_lock_info(conn)
+      write_lock_score(conn)
+
       yield job_id
     end
 
@@ -331,6 +333,20 @@ def write_lock_info(conn)
       conn.set(key.info, lock_info)
     end
 
+    #
+    # Writes lock score to redis.
+    #   The lock score is used to improve performance when iterating large sorted
+    #   sets e.g the schedule and retry sets.
+    #
+    #
+    # @return [void]
+    #
+    def write_lock_score(conn)
+      return unless lock_score?
+
+      conn.set(key.score, lock_score)
+    end
+
     #
     # Used to combat redis imprecision with ttl/pttl
     #
@@ -378,6 +394,27 @@ def lock_info
       )
     end
 
+    #
+    # Reads lock score from redis.
+    #   The lock score is used to improve performance when iterating large sorted
+    #   sets e.g the schedule and retry sets.
+    #
+    #
+    # @return [Float]
+    #
+    def lock_score
+      @lock_score ||= item[AT]
+    end
+
+    #
+    # Checks if a lock score exists.
+    #
+    # @return [true, false]
+    #
+    def lock_score?
+      !lock_score.nil?
+    end
+
     def redis_version
       @redis_version ||= SidekiqUniqueJobs.config.redis_version
     end
diff --git a/lib/sidekiq_unique_jobs/lua/delete.lua b/lib/sidekiq_unique_jobs/lua/delete.lua
index b4f6a6e64..adfca283d 100644
--- a/lib/sidekiq_unique_jobs/lua/delete.lua
+++ b/lib/sidekiq_unique_jobs/lua/delete.lua
@@ -1,11 +1,13 @@
 -------- BEGIN keys ---------
-local digest    = KEYS[1]
-local queued    = KEYS[2]
-local primed    = KEYS[3]
-local locked    = KEYS[4]
-local info      = KEYS[5]
-local changelog = KEYS[6]
-local digests   = KEYS[7]
+local digest           = KEYS[1]
+local queued           = KEYS[2]
+local primed           = KEYS[3]
+local locked           = KEYS[4]
+local info             = KEYS[5]
+local changelog        = KEYS[6]
+local digests          = KEYS[7]
+local expiring_digests = KEYS[8]
+local score            = KEYS[9]
 -------- END keys ---------
 
 -------- BEGIN lock arguments ---------
@@ -37,8 +39,8 @@ local count          = 0
 log_debug("ZREM", digests, digest)
 count = count + redis.call("ZREM", digests, digest)
 
-log_debug("UNLINK", digest, queued, primed, locked, info)
-count = count + redis.call("UNLINK", digest, queued, primed, locked, info)
+log_debug("UNLINK", digest, queued, primed, locked, info, score)
+count = count + redis.call("UNLINK", digest, queued, primed, locked, info, score)
 
 
 log("Deleted (" .. count .. ") keys")
diff --git a/lib/sidekiq_unique_jobs/lua/lock.lua b/lib/sidekiq_unique_jobs/lua/lock.lua
index 4d813e9a4..1f8aa3d0e 100644
--- a/lib/sidekiq_unique_jobs/lua/lock.lua
+++ b/lib/sidekiq_unique_jobs/lua/lock.lua
@@ -7,6 +7,7 @@ local info             = KEYS[5]
 local changelog        = KEYS[6]
 local digests          = KEYS[7]
 local expiring_digests = KEYS[8]
+local score            = KEYS[9]
 -------- END keys ---------
 
 
@@ -85,6 +86,9 @@ if pttl and pttl > 0 then
 
   log_debug("PEXPIRE", info, pttl)
   redis.call("PEXPIRE", info, pttl)
+
+  log_debug("PEXPIRE", score, pttl)
+  redis.call("PEXPIRE", score, pttl)
 end
 
 log_debug("PEXPIRE", queued, 1000)
diff --git a/lib/sidekiq_unique_jobs/lua/locked.lua b/lib/sidekiq_unique_jobs/lua/locked.lua
index 33203f6ea..9b92939e2 100644
--- a/lib/sidekiq_unique_jobs/lua/locked.lua
+++ b/lib/sidekiq_unique_jobs/lua/locked.lua
@@ -1,11 +1,13 @@
 -------- BEGIN keys ---------
-local digest    = KEYS[1]
-local queued    = KEYS[2]
-local primed    = KEYS[3]
-local locked    = KEYS[4]
-local info      = KEYS[5]
-local changelog = KEYS[6]
-local digests   = KEYS[7]
+local digest           = KEYS[1]
+local queued           = KEYS[2]
+local primed           = KEYS[3]
+local locked           = KEYS[4]
+local info             = KEYS[5]
+local changelog        = KEYS[6]
+local digests          = KEYS[7]
+local expiring_digests = KEYS[8]
+local score            = KEYS[9]
 -------- END keys ---------
 
 -------- BEGIN lock arguments ---------
diff --git a/lib/sidekiq_unique_jobs/lua/queue.lua b/lib/sidekiq_unique_jobs/lua/queue.lua
index 6c4787008..3fef4c426 100644
--- a/lib/sidekiq_unique_jobs/lua/queue.lua
+++ b/lib/sidekiq_unique_jobs/lua/queue.lua
@@ -6,6 +6,7 @@ local locked    = KEYS[4]
 local info      = KEYS[5]
 local changelog = KEYS[6]
 local digests   = KEYS[7]
+local score     = KEYS[8]
 -------- END keys ---------
 
 
diff --git a/lib/sidekiq_unique_jobs/lua/reap_orphans.lua b/lib/sidekiq_unique_jobs/lua/reap_orphans.lua
index b52f680e1..7a67c8564 100644
--- a/lib/sidekiq_unique_jobs/lua/reap_orphans.lua
+++ b/lib/sidekiq_unique_jobs/lua/reap_orphans.lua
@@ -77,8 +77,9 @@ repeat
       local run_primed = digest .. ":RUN:PRIMED"
       local run_locked = digest .. ":RUN:LOCKED"
       local run_info   = digest .. ":RUN:INFO"
+      local score      = digest .. ":SCORE"
 
-      redis.call("UNLINK", digest, queued, primed, locked, info, run_digest, run_queued, run_primed, run_locked, run_info)
+      redis.call("UNLINK", digest, queued, primed, locked, info, run_digest, run_queued, run_primed, run_locked, run_info, score)
 
       redis.call("ZREM", digests_set, digest)
       del_count = del_count + 1
@@ -104,8 +105,9 @@ if del_count < reaper_count then
       local run_primed = digest .. ":RUN:PRIMED"
       local run_locked = digest .. ":RUN:LOCKED"
       local run_info   = digest .. ":RUN:INFO"
+      local score      = digest .. ":SCORE"
 
-      redis.call("UNLINK", digest, queued, primed, locked, info, run_digest, run_queued, run_primed, run_locked, run_info)
+      redis.call("UNLINK", digest, queued, primed, locked, info, run_digest, run_queued, run_primed, run_locked, run_info, score)
 
       redis.call("ZREM", expiring_digests_set, digest)
       del_count = del_count + 1
diff --git a/lib/sidekiq_unique_jobs/lua/shared/_delete_from_sorted_set.lua b/lib/sidekiq_unique_jobs/lua/shared/_delete_from_sorted_set.lua
index 78f53cab4..654c1acec 100644
--- a/lib/sidekiq_unique_jobs/lua/shared/_delete_from_sorted_set.lua
+++ b/lib/sidekiq_unique_jobs/lua/shared/_delete_from_sorted_set.lua
@@ -1,11 +1,19 @@
 local function delete_from_sorted_set(name, digest)
-  local per   = 50
-  local total = redis.call("zcard", name)
-  local index = 0
+  local offset = 0
+  local per    = 50
+  local total  = redis.call("zcard", name)
+  local score  = redis.call("get", digest .. ":SCORE")
   local result
 
-  while (index < total) do
-    local items = redis.call("ZRANGE", name, index, index + per -1)
+  while (offset < total) do
+    local items
+
+    if score then
+      items = redis.call("ZRANGE", name, score, "+inf", "BYSCORE", "LIMIT", offset, per)
+    else
+      items = redis.call("ZRANGE", name, offset, offset + per -1)
+    end
+
     for _, item in pairs(items) do
       if string.find(item, digest) then
         redis.call("ZREM", name, item)
@@ -13,7 +21,9 @@ local function delete_from_sorted_set(name, digest)
         break
       end
     end
-    index = index + per
+
+    offset = offset + per
   end
+
   return result
 end
diff --git a/lib/sidekiq_unique_jobs/lua/unlock.lua b/lib/sidekiq_unique_jobs/lua/unlock.lua
index 70d44bf1a..36895edbb 100644
--- a/lib/sidekiq_unique_jobs/lua/unlock.lua
+++ b/lib/sidekiq_unique_jobs/lua/unlock.lua
@@ -1,11 +1,13 @@
 -------- BEGIN keys ---------
-local digest    = KEYS[1]
-local queued    = KEYS[2]
-local primed    = KEYS[3]
-local locked    = KEYS[4]
-local info      = KEYS[5]
-local changelog = KEYS[6]
-local digests   = KEYS[7]
+local digest           = KEYS[1]
+local queued           = KEYS[2]
+local primed           = KEYS[3]
+local locked           = KEYS[4]
+local info             = KEYS[5]
+local changelog        = KEYS[6]
+local digests          = KEYS[7]
+local expiring_digests = KEYS[8]
+local score            = KEYS[9]
 -------- END keys ---------
 
 
@@ -71,6 +73,9 @@ if lock_type ~= "until_expired" then
   log_debug("UNLINK", digest, info)
   redis.call("UNLINK", digest, info)
 
+  log_debug("UNLINK", score, info)
+  redis.call("UNLINK", score, info)
+
   log_debug("HDEL", locked, job_id)
   redis.call("HDEL", locked, job_id)
 end
diff --git a/spec/sidekiq_unique_jobs/key_spec.rb b/spec/sidekiq_unique_jobs/key_spec.rb
index 728195516..db865e23e 100644
--- a/spec/sidekiq_unique_jobs/key_spec.rb
+++ b/spec/sidekiq_unique_jobs/key_spec.rb
@@ -28,6 +28,7 @@
         uniquejobs:changelog
         uniquejobs:digests
         uniquejobs:expiring_digests
+        #{digest_one}:SCORE
       ],
     )
   end
diff --git a/spec/sidekiq_unique_jobs/lock_spec.rb b/spec/sidekiq_unique_jobs/lock_spec.rb
index cc9162346..0c6e5902c 100644
--- a/spec/sidekiq_unique_jobs/lock_spec.rb
+++ b/spec/sidekiq_unique_jobs/lock_spec.rb
@@ -16,6 +16,7 @@
           primed_jids: []
           locked_jids: []
            changelogs: []
+                score:\s
     MESSAGE
   end
 
@@ -45,7 +46,7 @@
 
     it "creates all expected keys in redis" do
       create
-      expect(keys).to contain_exactly(key.digest, key.locked, key.info, key.changelog, key.digests)
+      expect(keys).to contain_exactly(key.digest, key.locked, key.info, key.changelog, key.digests, key.score)
       expect(create.locked_jids).to include(job_id)
     end
   end
@@ -70,7 +71,7 @@
     it "creates keys and adds job_id to locked hash" do
       expect { lock }.to change { entity.locked_jids }.to([job_id])
 
-      expect(keys).to contain_exactly(key.digest, key.locked, key.info, key.changelog, key.digests)
+      expect(keys).to contain_exactly(key.digest, key.locked, key.info, key.changelog, key.digests, key.score)
     end
   end
 
@@ -82,7 +83,7 @@
     it "creates keys and adds job_id to locked hash" do
       expect { lock }.to change { entity.locked_jids }.to([job_id])
       del
-      expect(keys).not_to contain_exactly(key.digest, key.locked, key.info, key.changelog, key.digests)
+      expect(keys).not_to contain_exactly(key.digest, key.locked, key.info, key.changelog, key.digests, key.score)
     end
   end