Can you run Forge and Optifine at the same time 1.14 4?
Yes, and it works.
Remember that it will not show up in your mod list, your must go to video settings to confirm Optifine has loaded.
Personally, I think Forge may not recognize Optifine as a mod since you can install it as a minecraft version.
How do I install Optifine 1.14 3 with Forge?
How To Download & Install Optifine in Minecraft 1.14.3 –
How do I use shaders with Forge?
How to use Shaders + Optifine with Forge Mods (Minecraft 2018
How do I use Optifine 1.14 mods?
OPTIFINE 1.14.4 minecraft & MODS 1.14.4 – how to download