diff --git a/src/lavinmq/client/channel.cr b/src/lavinmq/client/channel.cr
index 4280683aec..13339a70ea 100644
--- a/src/lavinmq/client/channel.cr
+++ b/src/lavinmq/client/channel.cr
@@ -435,22 +435,10 @@ module LavinMQ
         notify_has_capacity(count)
       end
 
-      def unacked_for_queue(queue) : Iterator(SegmentPosition)
-        @unacked.each.select(&.queue.==(queue)).map(&.sp)
-      end
-
       def unacked_count
         @unacked.size
       end
 
-      def each_unacked(& : Unack -> Nil)
-        @unack_lock.synchronize do
-          @unacked.each do |unack|
-            yield unack
-          end
-        end
-      end
-
       record TxAck, delivery_tag : UInt64, multiple : Bool, negative : Bool, requeue : Bool
       @tx_acks = Array(TxAck).new
 
diff --git a/src/lavinmq/client/channel/consumer.cr b/src/lavinmq/client/channel/consumer.cr
index e7d1c5dd60..b47ba9f3b2 100644
--- a/src/lavinmq/client/channel/consumer.cr
+++ b/src/lavinmq/client/channel/consumer.cr
@@ -160,10 +160,6 @@ module LavinMQ
           end
         end
 
-        def name
-          @tag
-        end
-
         # blocks until the consumer can accept more messages
         private def wait_for_capacity : Nil
           if @prefetch_count > 0
diff --git a/src/lavinmq/client/client.cr b/src/lavinmq/client/client.cr
index 76232850fd..5461caeb83 100644
--- a/src/lavinmq/client/client.cr
+++ b/src/lavinmq/client/client.cr
@@ -62,22 +62,6 @@ module LavinMQ
       spawn read_loop, name: "Client#read_loop #{@remote_address}"
     end
 
-    # socket's file descriptor
-    def fd
-      case @socket
-      when OpenSSL::SSL::Socket
-        @socket.as(OpenSSL::SSL::Socket).@bio.io.as(IO::FileDescriptor).fd
-      when TCPSocket
-        @socket.as(TCPSocket).fd
-      when UNIXSocket
-        @socket.as(UNIXSocket).fd
-      when WebSocketIO
-        @socket.as(WebSocketIO).fd
-      else
-        raise "Unexpected socket #{@socket.class}"
-      end
-    end
-
     # Returns client provided connection name if set, else server generated name
     def client_name
       @client_properties["connection_name"]?.try(&.as(String)) || @name
diff --git a/src/lavinmq/http/controller.cr b/src/lavinmq/http/controller.cr
index 97440b1185..b793a42093 100644
--- a/src/lavinmq/http/controller.cr
+++ b/src/lavinmq/http/controller.cr
@@ -227,13 +227,6 @@ module LavinMQ
         end
       end
 
-      private def refuse_unless_monitoring(context, user)
-        unless user.tags.any? { |t| t.administrator? || t.monitoring? }
-          Log.warn { "user=#{user.name} does not have monitoring access" }
-          access_refused(context)
-        end
-      end
-
       private def refuse_unless_administrator(context, user : User)
         unless user.tags.any? &.administrator?
           Log.warn { "user=#{user.name} does not have administrator access" }
diff --git a/src/lavinmq/http/handler/websocket.cr b/src/lavinmq/http/handler/websocket.cr
index e09fc5aad0..9fed47a605 100644
--- a/src/lavinmq/http/handler/websocket.cr
+++ b/src/lavinmq/http/handler/websocket.cr
@@ -55,11 +55,5 @@ module LavinMQ
     def read_timeout=(timeout)
       @r.read_timeout = timeout
     end
-
-    def fd
-      io = @ws.@ws.@io
-      return io.fd if io.responds_to?(:fd)
-      0
-    end
   end
 end
diff --git a/src/lavinmq/http/http_server.cr b/src/lavinmq/http/http_server.cr
index 8f55da539f..371ce735df 100644
--- a/src/lavinmq/http/http_server.cr
+++ b/src/lavinmq/http/http_server.cr
@@ -45,11 +45,6 @@ module LavinMQ
         @http = ::HTTP::Server.new(handlers)
       end
 
-      def bind(socket)
-        addr = @http.bind(socket)
-        Log.info { "Bound to #{addr}" }
-      end
-
       def bind_tcp(address, port)
         addr = @http.bind_tcp address, port
         Log.info { "Bound to #{addr}" }
@@ -83,10 +78,6 @@ module LavinMQ
         File.delete?(INTERNAL_UNIX_SOCKET)
       end
 
-      def closed?
-        @http.closed?
-      end
-
       class NotFoundError < Exception; end
 
       class ExpectedBodyError < ArgumentError; end
diff --git a/src/lavinmq/message.cr b/src/lavinmq/message.cr
index c0bf2f60a3..d66ecc30c9 100644
--- a/src/lavinmq/message.cr
+++ b/src/lavinmq/message.cr
@@ -54,15 +54,6 @@ module LavinMQ
       body = bytes[pos, sz]
       BytesMessage.new(ts, ex, rk, pr, sz, body)
     end
-
-    def to_io(io : IO, format = IO::ByteFormat::SystemEndian)
-      io.write_bytes @timestamp, format
-      io.write_bytes AMQ::Protocol::ShortString.new(@exchange_name), format
-      io.write_bytes AMQ::Protocol::ShortString.new(@routing_key), format
-      io.write_bytes @properties, format
-      io.write_bytes @bodysize, format
-      io.write @body
-    end
   end
 
   # Messages from publishers, read from socket and then written to mmap files
@@ -87,16 +78,6 @@ module LavinMQ
         @properties.bytesize + sizeof(UInt64) + @bodysize
     end
 
-    def dlx : String?
-      @properties.headers.try(&.fetch("x-dead-letter-exchange", nil).as?(String))
-    end
-
-    def delay : UInt32?
-      @properties.headers.try(&.fetch("x-delay", nil)).as?(Int).try(&.to_u32)
-    rescue OverflowError
-      nil
-    end
-
     def to_io(io : IO, format = IO::ByteFormat::SystemEndian)
       io.write_bytes @timestamp, format
       io.write_bytes AMQ::Protocol::ShortString.new(@exchange_name), format
diff --git a/src/lavinmq/mfile.cr b/src/lavinmq/mfile.cr
index 9356c57712..e864c43064 100644
--- a/src/lavinmq/mfile.cr
+++ b/src/lavinmq/mfile.cr
@@ -42,11 +42,6 @@ class MFile < IO
     end
   end
 
-  # Opens an existing file in readonly mode
-  def self.open(path) : self
-    self.new(path)
-  end
-
   # Opens an existing file in readonly mode
   def self.open(path, & : self -> _)
     mfile = self.new(path)
@@ -75,12 +70,6 @@ class MFile < IO
     stat.st_size.to_i64
   end
 
-  def disk_usage : Int64
-    code = LibC.fstat(@fd, out stat)
-    raise File::Error.from_errno("Unable to get info", file: @path) if code < 0
-    stat.st_blocks.to_i64 * 512
-  end
-
   private def mmap(length = @capacity) : Pointer(UInt8)
     return Pointer(UInt8).null if length.zero?
     protection = case
@@ -175,17 +164,6 @@ class MFile < IO
     raise RuntimeError.from_errno("msync") if code < 0
   end
 
-  private def mremap(addr, old_len, new_len) : Pointer(UInt8)
-    {% if flag?(:linux) %}
-      ptr = LibC.mremap(addr, old_len, new_len, LibC::MREMAP_MAYMOVE)
-      raise IO::Error.from_errno("mremap") if ptr == LibC::MAP_FAILED
-      ptr.as(UInt8*)
-    {% else %}
-      munmap(addr, old_len)
-      mmap(addr, new_len)
-    {% end %}
-  end
-
   def finalize
     LibC.close(@fd) if @fd > -1
     LibC.munmap(@buffer, @capacity) unless @buffer.null?
@@ -271,46 +249,9 @@ class MFile < IO
     DontNeed
   end
 
-  def truncate(capacity : Int) : Nil
-    return if capacity == @capacity
-    capacity = capacity.to_i64
-    code = LibC.ftruncate(@fd, capacity)
-    raise File::Error.from_errno("Error truncating file", file: @path) if code < 0
-    old_capacity = @capacity
-    @capacity = capacity
-    @size = capacity if @size > capacity
-    @pos = capacity if @pos > capacity
-    @buffer = mremap(@buffer, old_capacity, capacity) unless @buffer.null?
-  end
-
   def resize(new_size : Int) : Nil
     raise ArgumentError.new("Can't expand file larger than capacity, use truncate") if new_size > @capacity
     @size = new_size.to_i64
     @pos = new_size.to_i64 if @pos > new_size
   end
-
-  def rename(new_path)
-    File.rename @path, new_path
-    @path = new_path
-  end
-
-  def read_at(offset : Int, slice : Bytes)
-    total = slice.size
-    until slice.empty?
-      cnt = LibC.pread(@fd, slice, slice.size, offset)
-      raise File::Error.from_errno("pread", file: @path) if cnt < 0
-      break if cnt.zero?
-      slice += cnt
-      offset += cnt
-    end
-    total - slice.size
-  end
-
-  PAGESIZE = LibC.sysconf(LibC::SC_PAGESIZE).to_u32
-
-  private def page_align(n : Int) : Int
-    n += PAGESIZE - 1
-    n -= n & PAGESIZE - 1
-    n
-  end
 end
diff --git a/src/lavinmq/parameter_store.cr b/src/lavinmq/parameter_store.cr
index 8759ea5f1b..f9a5926d48 100644
--- a/src/lavinmq/parameter_store.cr
+++ b/src/lavinmq/parameter_store.cr
@@ -12,11 +12,6 @@ module LavinMQ
 
     forward_missing_to @parameters
 
-    def create(data : JSON::Any, save = true)
-      p = T.from_json(data)
-      create(p, save)
-    end
-
     def create(parameter : T, save = true)
       @parameters[parameter.name] = parameter
       save! if save
@@ -50,10 +45,6 @@ module LavinMQ
       end
     end
 
-    def close
-      save!
-    end
-
     def to_json(json : JSON::Builder)
       json.array do
         each_value do |p|
diff --git a/src/lavinmq/proxy_protocol.cr b/src/lavinmq/proxy_protocol.cr
index c1f4834752..21f5f49d43 100644
--- a/src/lavinmq/proxy_protocol.cr
+++ b/src/lavinmq/proxy_protocol.cr
@@ -47,12 +47,6 @@ module LavinMQ
       ensure
         io.read_timeout = nil
       end
-
-      def self.encode(header, io)
-        ipv = header.src.family.inet6? ? 6 : 4
-        io.print "PROXY TCP#{ipv} #{header.src.address} #{header.dst.address} #{header.src.port} #{header.dst.port}\r\n"
-        io.flush
-      end
     end
 
     module V2
diff --git a/src/lavinmq/queue/queue.cr b/src/lavinmq/queue/queue.cr
index 47c276dce7..2c7f935aa9 100644
--- a/src/lavinmq/queue/queue.cr
+++ b/src/lavinmq/queue/queue.cr
@@ -294,10 +294,6 @@ module LavinMQ
       @msg_store.empty?
     end
 
-    def any? : Bool
-      !empty?
-    end
-
     def consumer_count
       @consumers.size.to_u32
     end
diff --git a/src/lavinmq/queue/stream_queue_message_store.cr b/src/lavinmq/queue/stream_queue_message_store.cr
index 0226e38ced..6ee7b4f5a5 100644
--- a/src/lavinmq/queue/stream_queue_message_store.cr
+++ b/src/lavinmq/queue/stream_queue_message_store.cr
@@ -195,11 +195,6 @@ module LavinMQ
         start_size - @size
       end
 
-      private def update_stat_per_msg(seg, ts, bytesize)
-        super
-        @segment_last_ts[seg] = last_ts
-      end
-
       def delete(sp) : Nil
         raise "Only full segments should be deleted"
       end
diff --git a/src/lavinmq/schema.cr b/src/lavinmq/schema.cr
index 8a862d1cf0..f12faf75e4 100644
--- a/src/lavinmq/schema.cr
+++ b/src/lavinmq/schema.cr
@@ -292,12 +292,6 @@ module LavinMQ
       file.flush
       version
     end
-
-    def self.verify_or_prefix(file, type) : Int32
-      verify(file, type)
-    rescue IO::EOFError
-      prefix(file, type)
-    end
   end
 
   class OutdatedSchemaVersion < Exception
diff --git a/src/lavinmq/shovel/shovel.cr b/src/lavinmq/shovel/shovel.cr
index d9fb4c6651..13afdccd0e 100644
--- a/src/lavinmq/shovel/shovel.cr
+++ b/src/lavinmq/shovel/shovel.cr
@@ -372,10 +372,6 @@ module LavinMQ
         Log.info &.emit("Terminated", name: @name, vhost: @vhost.name)
       end
 
-      def delete
-        terminate
-      end
-
       def terminated?
         @state.terminated?
       end
diff --git a/src/lavinmq/shovel/shovel_store.cr b/src/lavinmq/shovel/shovel_store.cr
index 3b1b908230..b8693287d6 100644
--- a/src/lavinmq/shovel/shovel_store.cr
+++ b/src/lavinmq/shovel/shovel_store.cr
@@ -41,12 +41,6 @@ module LavinMQ
       end
     end
 
-    def each(&)
-      @shovels.each_value do |v|
-        yield v
-      end
-    end
-
     private def destination(name, config, ack_mode, delete_after, prefetch)
       uri = URI.parse(config["dest-uri"].as_s)
       case uri.scheme
diff --git a/src/lavinmq/user.cr b/src/lavinmq/user.cr
index d86a878831..299b2459fb 100644
--- a/src/lavinmq/user.cr
+++ b/src/lavinmq/user.cr
@@ -10,10 +10,6 @@ module LavinMQ
     PolicyMaker
     Impersonator
 
-    def to_json(json : JSON::Builder)
-      to_s.downcase.to_json(json)
-    end
-
     def self.parse_list(list : String) : Array(Tag)
       list.split(",").compact_map { |t| Tag.parse?(t.strip) }
     end
@@ -212,17 +208,6 @@ module LavinMQ
       perm != /^$/ && perm != // && perm.matches? name
     end
 
-    private def hash_algorithm(hash)
-      case hash
-      when /^\$2a\$/ then "Bcrypt"
-      when /^\$1\$/  then "MD5"
-      when /^\$5\$/  then "SHA256"
-      when /^\$6\$/  then "SHA512"
-      when /^$/      then ""
-      else                raise UnknownHashAlgoritm.new
-      end
-    end
-
     class UnknownHashAlgoritm < Exception; end
   end
 end
diff --git a/src/stdlib/channel.cr b/src/stdlib/channel.cr
index fbe4ac76f9..28c575462f 100644
--- a/src/stdlib/channel.cr
+++ b/src/stdlib/channel.cr
@@ -34,22 +34,6 @@ class Channel(T)
     @lock.unlock
   end
 
-  def try_receive : T?
-    @lock.lock
-    state, value = receive_internal
-    case state
-    in .delivered?
-      raise "BUG: Unexpected UseDefault value for delivered receive" if value.is_a?(UseDefault)
-      value
-    in .closed?
-      raise ClosedError.new
-    in .none?
-      nil
-    end
-  ensure
-    @lock.unlock
-  end
-
   def try_receive? : T?
     @lock.lock
     state, value = receive_internal
diff --git a/src/stdlib/io_memory.cr b/src/stdlib/io_memory.cr
deleted file mode 100644
index 0940531458..0000000000
--- a/src/stdlib/io_memory.cr
+++ /dev/null
@@ -1,5 +0,0 @@
-class IO::Memory
-  def capacity
-    @capacity
-  end
-end