Lag spikes on Forest fight? (Blockwars)

[Earth]

Whenever I place a block near the flag my screen Always freezes for like 0.3 seconds, but after a little while it doesn't happen anymore...
Am I the only one?

 

[NedGaming]

I play blockwars much but never had this, any proof?

 

[Earth]

I play blockwars much but never had this, any proof?

I'll record it when the map's open again.

 

[Despacito 2]

I don't have this problem....
But have everything turned off with Optifine...
Weird...