I have noticed that in the developmental environment when youhave open an assts folder minecraft when launching stops at rendering global instances this is on forge version 1.7.10-10.13.3.1400

Here is the log

 

 

[09:54:37] [main/INFO]: Logging in with username & password

[09:55:11] [main/INFO]: Setting user: UnnamedProdigy

[09:55:25] [Client thread/INFO]: LWJGL Version: 2.9.1

[09:56:12] [Client thread/INFO]: Reloading ResourceManager: Default, FMLFileResourcePack:Forge Mod Loader, FMLFileResourcePack:Minecraft Forge, FMLFileResourcePack:Not Enough Items, FMLFileResourcePack:Lightning Materials, FMLFileResourcePack:CoFH Core, FMLFileResourcePack:Thermal Expansion, FMLFileResourcePack:Thermal Foundation

[09:56:34] [sound Library Loader/INFO]: Sound engine started

[09:56:58] [Client thread/INFO]: Created: 512x256 textures/blocks-atlas

[09:57:02] [Client thread/INFO]: Created: 512x512 textures/items-atlas

[09:57:21] [Client thread/INFO]: Reloading ResourceManager: Default, FMLFileResourcePack:Forge Mod Loader, FMLFileResourcePack:Minecraft Forge, FMLFileResourcePack:Not Enough Items, FMLFileResourcePack:Lightning Materials, FMLFileResourcePack:CoFH Core, FMLFileResourcePack:Thermal Expansion, FMLFileResourcePack:Thermal Foundation

[09:57:26] [Client thread/INFO]: Created: 512x512 textures/items-atlas

[09:57:35] [Client thread/INFO]: Created: 512x512 textures/blocks-atlas

[09:57:38] [sound Library Loader/INFO]: Sound engine started

 

 

I already know how to avoid this, but thought that I would report this to you so that you can fix it.