Problem Block / Tick Lag

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S

SgtPhysics

Guest
What OS are you running?
Ubuntu Server 16.04 LTS

Are you using minecraft hosting provider or a dedicated/local server not designed for minecraft?
nfoservers.com VDS

What version of FTB are you using?
FTBServer-1.7.10-1614

Did you add any mods to the server pack?
No, I did disabled EnderZoo.

What are your server specs?
Four core HT CPU (Intel Sandy Bridge or better)
5120 RAM

A good detailed paragraph about the problem

I am having severe block lag on the server. I've tried many different things to resolve the issue. (I have no reason to believe it is an internet issue). As I write this, I am in the only one on the server. I have no machines running in the world except for a TiC Smeltery that is idle. While I sit idle in the server, there is a constant flow of 'Can't keep up! ... running X ms behind, skipped Y ticks'.

Server Log Sample
[01:43:36] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 14996ms behind, skipping 299 tick(s)
[01:43:47] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 6929ms behind, skipping 138 tick(s)
[01:44:12] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 14082ms behind, skipping 281 tick(s)
[01:44:24] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 7685ms behind, skipping 153 tick(s)
[01:44:46] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 12272ms behind, skipping 245 tick(s)
[01:44:56] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 6433ms behind, skipping 128 tick(s)
[01:45:19] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 12327ms behind, skipping 246 tick(s)
[01:45:30] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 7345ms behind, skipping 146 tick(s)

I tried:
Reduce view distance to 8.
Remove Fast Craft.
Create a new world.
Server Reboot (the actual server, not just MC)
Alter ServerStart.sh commands.
(No Chunks are kept loaded via in game tools, etc)

Currently using:
-server -Xms1024M -Xmx4096M -XX:permSize=256M -XX:+UseParNewGC -XX:+CMSIncrementalPacing -XX:+CMSClassUnloadingEnabled -XX:parallelGCThreads=2 -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 -jar FTBServer-1.7.10-1614.jar nogui

free -m output:
total used free shared buff/cache available
Mem: 4954 2315 2209 6 429 2555
Swap: 0 0 0

I installed Sampler. Let it run for a while and used /sampler tps/counts

[01:36:53] [Server thread/INFO]: Overworld (0): 484 chunks, 374 tes, 107 ticking tes, 320 entities
[01:36:53] [Server thread/INFO]: Nether (-1): 0 chunks, 0 tes, 0 ticking tes, 0 entities
[01:36:53] [Server thread/INFO]: The End (1): 0 chunks, 0 tes, 0 ticking tes, 0 entities
[01:36:53] [Server thread/INFO]: Twilight Forest (-7): 0 chunks, 0 tes, 0 ticking tes, 0 entities
[01:36:53] [Server thread/INFO]: Underdark (-100): 0 chunks, 0 tes, 0 ticking tes, 0 entities
[01:36:53] [Server thread/INFO]: Dungeon (-34): 0 chunks, 0 tes, 0 ticking tes, 0 entities
[01:36:53] [Server thread/INFO]: Spirit World (-37): 0 chunks, 0 tes, 0 ticking tes, 0 entities
[01:36:53] [Server thread/INFO]: Torment (-38): 0 chunks, 0 tes, 0 ticking tes, 0 entities
[01:36:53] [Server thread/INFO]: Mirror (-39): 0 chunks, 0 tes, 0 ticking tes, 0 entities
[01:36:53] [Server thread/INFO]: Bedrock (-19): 0 chunks, 0 tes, 0 ticking tes, 0 entities
[01:36:53] [Server thread/INFO]: The Outer Lands (-42): 0 chunks, 0 tes, 0 ticking tes, 0 entities
[01:36:53] [Server thread/INFO]: The Last Millenium (-112): 0 chunks, 0 tes, 0 ticking tes, 0 entities
[01:36:53] [Server thread/INFO]: Total: 12 dimensions, 484 chunks, 374 tes, 107 ticking tes, 320 entities

[01:45:50] [Server thread/INFO]: average tps: 10.5 (52%, moderate lag)
[01:45:50] [Server thread/INFO]: total period: 104.2 ms (avg 95.5 ms, min 51.1 ms, max 155.9 ms)
[01:45:50] [Server thread/INFO]: active period: 104.2 ms (avg 95.2 ms, min 51.1 ms, max 155.9 ms)

Any suggestions would be appreciated. I don't think it is a hardware issue, but maybe some one can clear it up either way.

Thanks