Frames dropping in Mine-craft?!

[johngoojohn.goo]

Hello, i have just finished building my new computer and i love playing on it but when im playing one of the games i have (lowly mine-craft) My frames start to drop randomly when im playing in a server lobby. This should not happen because minecraft is not a hard game to run and my pc should be able to run it. Here is my part list.

Ryzen 7 1700X @~ $289.99 + Free Shipping
ASUS PRIME X370-A AMD Ryzen AM4 DDR4 HDMI DVI VGA M.2 USB 3.1 ATX X370 Motherboard @~ $99.99 + $1.99 Shipping ~ $101.98
Seasonic FOCUS Plus Series SSR-850FX 850W 80+ Gold ATX12V & EPS12V Full Modular 120mm FDB Fan Compact 140 mm Size Power Supply @~ $109.99 + Rebate @ $20.00 ~ $89.99 + Free Shipping
ADATA SU800 M.2 2280 128GB Ultimate 3D NAND Solid State Drive @~ $54.99 + Free Shipping
ADATA XPG GAMMIX D10 16GB (2 x 8GB) 288-Pin DDR4 SDRAM DDR4 2666 (PC4 21300) @~ $139.99
MasterBox 5 Black & White Mid-tower with Internal Configuration @~ $54.99 + Rebate @ $10.00 ~ $44.99 + Free Shipping
Cooler Master Hyper 212 EVO - CPU Cooler with 120mm PWM Fan @~ $29.99 + Rebate @ $10.00 ~ $19.99 + Free Shipping
ASUS ROG Strix Radeon RX 560 O4G EVO Gaming OC Edition GDDR5 DP HDMI DVI AMD Graphics Card (ROG-STRIX-RX560-O4G-EVO-GAMING) @~ $139.99 + $3.99 Shipping ~ $143.98 + $10.00 Rebate ~ $133.98
Pixio New PX277 27 inch 144Hz AMD Freesync Adaptive sync WQHD 2560 x 1440 Wide Screen Bezel Less Display Professional IPS (AH-VA) Gaming Monitor @~ $359.99 + 3 Year protection plan @~ $44.99 ~ $404.98
Windows 10 Home OEM Key @~ $35.50
With Monitor total is $1316.38
Without it is $911.4

Please help me figure out why the frames drop?

 

[businesshopee]

Here is My craft Url : http://www.ishashoppe.com/in/