my game output shows the following and i am experienceing some block and entity lag but my frames are fine and not to many lag spikes in the alt f3 debug menu......

[19:16:02] [Server thread/WARN]: Tried to add entity Item with pending removal and duplicate UUID ac78f7f3-eecf-4d54-b3ef-1320c71adcb5
[19:16:02] [Server thread/WARN]: Tried to add entity Item with pending removal and duplicate UUID 0dfe0e4c-e20d-4fad-a1e7-85f8ad45782f
[19:16:02] [Server thread/WARN]: Tried to add entity Item with pending removal and duplicate UUID 7cad2135-1303-4ec1-80d2-c24687c947c6
[19:16:02] [Server thread/WARN]: Tried to add entity Item with pending removal and duplicate UUID fe653615-5f94-4ba3-86bf-4aa385b5d1d2
[19:16:02] [Server thread/WARN]: Tried to add entity Bat with pending removal and duplicate UUID 114da636-aa56-461b-b798-46b0b7d5fcc6
[19:16:02] [Server thread/WARN]: Tried to add entity Bat with pending removal and duplicate UUID 4d7a5196-401b-4e04-9c7d-6c87c11adcb6
[19:16:02] [Server thread/WARN]: Tried to add entity Bat with pending removal and duplicate UUID 71c13592-4148-476f-8b51-5759f6f130c5
[19:16:02] [Server thread/WARN]: Tried to add entity Bat with pending removal and duplicate UUID 0b307f4d-e6c0-460e-a11f-544bf8355716
[19:16:02] [Server thread/WARN]: Tried to add entity Bat with pending removal and duplicate UUID 09cb572a-fb42-4b6c-a764-520e3c02d18b
[19:16:02] [Server thread/WARN]: Tried to add entity Bat with pending removal and duplicate UUID 8b009034-d91c-4dc5-9ab2-0a84028fa863
[19:16:02] [Server thread/WARN]: Tried to add entity Bat with pending removal and duplicate UUID e0604d61-a319-4f41-8079-00d524e6b413
[19:16:02] [Server thread/WARN]: Tried to add entity Item with pending removal and duplicate UUID 770dce3b-5e76-4f54-8dc4-61eef504eadf
[19:16:02] [Server thread/WARN]: Tried to add entity Item with pending removal and duplicate UUID 40deea5e-c85e-4339-97fb-d47f47153bfe
[19:16:02] [Server thread/WARN]: Tried to add entity Item with pending removal and duplicate UUID cbc358a1-dd03-4612-a72d-59b7de1e725a
[19:16:02] [Server thread/WARN]: Tried to add entity Item with pending removal and duplicate UUID b770d070-3416-4d97-9b69-d8e7124f8c2a
[19:16:06] [Server thread/WARN]: Tried to add entity Zombie with pending removal and duplicate UUID 6e38c3a2-eab6-490c-a4a6-79e0d16d7bcc
[19:16:12] [Server thread/WARN]: Tried to add entity Skeleton with pending removal and duplicate UUID 4b2561ca-95a4-47e7-a1e8-7c6c80ab44f8
[19:16:12] [Server thread/WARN]: Tried to add entity Skeleton with pending removal and duplicate UUID e30191cf-28e7-4952-bf59-49f3719c95f8
[19:16:17] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 21102ms behind, skipping 422 tick(s)
[19:16:20] [Server thread/WARN]: Tried to add entity Item with pending removal and duplicate UUID 2e6a18fb-85aa-4fb1-a5cb-5761c9dfbdf9
[19:16:21] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 4479ms behind, skipping 89 tick(s)
[19:16:22] [Server thread/WARN]: Tried to add entity Skeleton with pending removal and duplicate UUID 51dfdffa-b1e3-4776-a037-01bfbf619ddb
[19:16:22] [Server thread/WARN]: Tried to add entity Spider with pending removal and duplicate UUID cbb5eca0-f86d-4515-a04b-c1c977c0ea71
[19:16:22] [Server thread/WARN]: Tried to add entity MinecartChest with pending removal and duplicate UUID e68d3f98-3c0c-4d9d-b18b-9ad6596424b1
[19:16:24] [Server thread/WARN]: Tried to add entity Item with pending removal and duplicate UUID 2e6a18fb-85aa-4fb1-a5cb-5761c9dfbdf9
[19:16:32] [Server thread/WARN]: Tried to add entity Rabbit with pending removal and duplicate UUID 088e8e35-b5ca-4d1b-b0a3-722c961d39ce
[19:16:49] [Server thread/INFO]: Saving and pausing game...
[19:16:49] [Server thread/INFO]: Saving chunks for level 'Let's Play'/Overworld
[19:16:49] [Server thread/INFO]: Saving chunks for level 'Let's Play'/Nether
[19:16:49] [Server thread/INFO]: Saving chunks for level 'Let's Play'/The End
[19:16:49] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 12801ms behind, skipping 256 tick(s)
[19:18:21] [Client thread/INFO]: Stopping!
[19:18:21] [Client thread/INFO]: SoundSystem shutting down...
[19:18:22] [Server thread/INFO]: Stopping server
[19:18:22] [Server thread/INFO]: Saving players
[19:18:22] [Server thread/INFO]: Saving worlds
[19:18:22] [Server thread/INFO]: Saving chunks for level 'Let's Play'/Overworld
[19:18:22] [Server thread/INFO]: Saving chunks for level 'Let's Play'/Nether
[19:18:22] [Server thread/INFO]: Saving chunks for level 'Let's Play'/The End
[19:18:22] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com