Describe the bug
Whenever Modern Sliding Doors placed in world are rendered they cause relatively noticeable fps drop, and they seem to rendered regardless of distance.
When compared with Malisis door mod which also uses tile entity model for doors and supports lot of customizability, custom malisis doors simply cost less fps and stop being rendered when you're far away or properly culled behind blocks with EntityCulling mod.

Crash report
none

To Reproduce

1. Load any world
2. Place several modern doors
3. Check the fps around the doors

Screenshots
Default Super flat world as is:

With 20 modern doors:

In case of custom Malisis doors:

Also comparison in my base with lots of processing tile entities:

• Minecraft Version: 1.12.2
• Mod Version: 6.3.1

No longer maintaining the 1.12.2 version of this mod.

Just for reference, this is still an issue with the most recent update (6.3.2).