WebGL loading speed on aws ubuntu node server is too slow.

I have an aws ec2 server with ubuntu 16.04. I'm running Node to serve a unity webgl page. The WebGl has a 200mb data file that takes 71 seconds to load every time I load it. How can I get the loading time down? On my local computer it loads in 4 seconds. Is this a problem with the server or my output settings. Or just the server speed? Why isn't it caching?

Edit: I just tested the server download of the same file. It's taking about 72 seconds for the data file to download directly, so that may explain it, but why isn't it caching the second time I load the page?

My player settings are:
dynamic batching: checked
compression format: gzip
data caching: checked
linker target :WebAssembly
scripting runtime: .net 4.x equivalent
C++ compiler configuration: release
Strip Engine Code: checked

My node script is

Code (JavaScript):

1. var express = require('express');
2. var app = express();
3. var http = require('http').Server(app);
4. var path = require('path');
5. app.use(express.static('public'));
6. app.use(compression());