Try loading utemplate.compiled before utemplate.source (way less memory usage)

[orzechow]

When working with render_templates(), the whole utemplate library is loaded:

picoweb/picoweb/__init__.py

Line 224 in 6e36850

import utemplate.source

This was a too high memory demand in my use case on an ESP8266. So I ended up comiling the template on my dev machine, putting this on the device and loading the compiled version manually (which works great):

import utemplate.compiled
template_loader = utemplate.compiled.Loader(None, "templates")
template = template_loader.load("config.html")

for s in template(config):
    yield from response.awrite(s)

But it would be nice to use the same API with source or compiled templates.
So please try loading the compiled files in _load_template() first, before importing utemplate.source.