How to optimize graphics / reduce lag from the packaged product

I’ve been working on a game for a School Project lately. I’m still really new to Unreal Engine 4. I dont have any programming background, so i’m only using Blueprints

The problem I’m having is that, When I run the game on my computer, It runs without lag considering It’s a gaming PC.

But i’m going to need to run this game on School computers, which are average and The packaged product gets really low frame rate, around 15 - 20

Possible Problems in the game (I think):

  • Lighting too high
  • Too much foliage
  • Meshes causing lag

So, Is there a way my game looks somewhat nice, but with good frame rate.

PS: I’m not sure whats causing the lag

Here are some pictures Involving Foliage