Custom theme causing hexo server and hexo generate to take up to several hours

Check List

Please check followings before submitting a new issue.

• I have already read the Docs page & Troubleshooting page
• I have already searched existing issues and they are not help to me
• I examined error or warning messages and it's difficult to solve
• Using the latest version of Hexo (run hexo version to check)
• Node.js is higher than 8.6.0

Actual behavior

I'm using hexo with a custom theme that I've built myself. In the past, generate and server times were manageable, but recently running hexo server can take upwards of 1 to 2 hours of processing time before I can view the site on localhost.

I know there can be several causes for this: number of posts on the site, number of tags used, not implementing the fragment_cache helper (or using the cache argument in partials), switch to a different markdown renderer to improve performance, making sure you're running hexo 4.0 or newer — but addressing these concerns do not seem to alleviate the problem I'm having.

My site has about 300 posts, most of them for one of my two podcasts, which use the hexo-generator-multiple-podcast plugin to generate the corresponding RSS-valid XML file via tags. I have about 60 tags total, with only two of them being used for RSS. I'm unsure if the podcast plugin is also contributing to the processing time. You can see the repo for my dev branch, as well as all of my attempts to improve the situation here: https://github.com/dylanilvento/wardsite/tree/develop

After reading about how hexo uses only one core to run these processes, I recently stumbled upon the fragment_cache helper that helps with processing. Looking up how to implement it took a second, and I'm still not sure if I've coded it properly since some examples use

<%- partial('_partial/partial-example', null, {cache: true}) %>

while others use

<%- partial('_partial/partial-example', {}, {cache: true}) %>

and I'm unsure if these are both valid syntax.

Other references to caching in hexo also mention enabling it in a config file somewhere, but are unclear which config file or what the syntax looks like. I found one example where you should add this to the root _config.yml file:

server:
  cache: true

But that did not seem to fix it either.

I'd appreciate any help on what I may be missing.

Environment & Settings

Node.js & npm version

node: v10.15.3 npm: v6.4.1

Your site _config.yml (Optional)

# Hexo Configuration
## Docs: https://hexo.io/docs/configuration.html
## Source: https://github.com/hexojs/hexo/

# Site
title: Ward
subtitle:
description:
keywords:
author:
language:
timezone: America/New_York

# URL
## If your site is put in a subdirectory, set url as 'http://yoursite.com/child' and root as '/child/'
url: http://ward-games.com
root: /
permalink: :layout/:title/
permalink_defaults:

# Directory
source_dir: source
public_dir: public
tag_dir: tags
archive_dir: archives
category_dir: categories
code_dir: downloads/code
i18n_dir: :lang
skip_render:

# Writing
new_post_name: :title.md # File name of new posts
default_layout: post
titlecase: false # Transform title into titlecase
external_link: true # Open external links in new tab
filename_case: 0
render_drafts: false
post_asset_folder: true
relative_link: false
future: true
highlight:
  enable: true
  line_number: true
  auto_detect: false
  tab_replace:
  
# Home page setting
# path: Root path for your blogs index page. (default = '')
# per_page: Posts displayed per page. (0 = disable pagination)
# order_by: Posts order. (Order by date descending by default)
index_generator:
  path: ''
  per_page: 10
  order_by: -date
  
# Category & Tag
default_category: uncategorized
category_map:
tag_map:

tag_generator:
  per_page: 20
  order_by: -date

# Date / Time format
## Hexo uses Moment.js to parse and display date
## You can customize the date format as defined in
## http://momentjs.com/docs/#/displaying/format/
date_format: MMMM Do, YYYY 
time_format: h:mm a

# Pagination
## Set per_page to 0 to disable pagination
per_page: 10
pagination_dir: page

# Extensions
## Plugins: https://hexo.io/plugins/
## Themes: https://hexo.io/themes/
theme: ward

podcasts:
- feed:
    path: wardcast.xml # relative to site root
    title: Wardcast
    subtitle: Missives from the front lines of game development.
    image: img/podcast/wardcast/wardcast-show-image.jpg # relative to config.url + config.root
    non_feed_url: tags/wardcast/ # the non-feed source for this content
    tag: wardcast # see below for tag-based feed
    limit: 500 # how many episodes will be in the feed, max
    content: true # whether to include text content along with the podcast; see note below
    content_encoded: true # same as above, but includes the complete encoded text of the post; see note below
    itunes:
      summary: 'Join Ward Games and friends on the journey of a lifetime: learning how to make games for a living! Listen in as we talk with game dev folks both local and from around the world about game development, gaming news, and more.'
      author: Ward Staff # defaults to config.author
      owner: Ward Games
      email: contact@ward-games.com # e-mail from which iTunes podcast is registered
      category: Leisure # the category from iTunes; make sure to use their values
      subcategory: Video Games # same as above
      explicit: yes # valid values are yes, no, and clean
    media_base_url: http://ward-games.com/wardcast/ # why repeat that in every post?
    default_media_type: audio/mpeg # can be overridden in post
- feed:
    path: attract-mode.xml # relative to site root
    title: 'Attract Mode: A Wardcast Series'
    subtitle: Wherein we watch every video game movie ever made.
    image: img/podcast/attract-mode/attract-mode-show-image.jpg # relative to config.url + config.root
    non_feed_url: tags/attract-mode/ # the non-feed source for this content
    tag: attract-mode # see below for tag-based feed
    limit: 100 # how many episodes will be in the feed, max
    content: true # whether to include text content along with the podcast; see note below
    content_encoded: true # same as above, but includes the complete encoded text of the post; see note below
    itunes:
      summary: 'Join Wardcast compatriots Dylan Ilvento, Nick Nundahl, and Joe Wetmore on their journey to watch every video game film to grace the silver screen — and some that didn’t even make it that far!'
      author: Ward Staff # defaults to config.author
      owner: Ward Games
      email: contact@ward-games.com # e-mail from which iTunes podcast is registered
      category: TV & Film # the category from iTunes; make sure to use their values
      subcategory: Film Reviews # same as above
      explicit: yes # valid values are yes, no, and clean
    media_base_url: http://ward-games.com/attract-mode/ # why repeat that in every post?
    default_media_type: audio/mpeg # can be overridden in post

# Deployment
## Docs: https://hexo.io/docs/deployment.html
deploy:
  type:

server:
  cache: true

Your theme _config.yml (Optional)

(This file is empty.)

Hexo and Plugin version(npm ls --depth 0)

hexo-site@0.0.0 /Users/dylan/Repos/wardsite
├── hexo@4.2.0
├── hexo-generator-archive@0.1.5
├── hexo-generator-category@0.1.3
├── hexo-generator-index@0.2.1
├── hexo-generator-multiple-podcast@0.9.5
├── hexo-generator-tag@0.2.0
├── hexo-renderer-ejs@0.3.1
├── hexo-renderer-markdown-it@4.1.0
├── hexo-renderer-stylus@0.3.3
└── hexo-server@0.3.3

Your package.json package.json

{
  "name": "hexo-site",
  "version": "0.0.0",
  "private": true,
  "hexo": {
    "version": "4.2.0"
  },
  "dependencies": {
    "hexo": "^4.2.0",
    "hexo-generator-archive": "^0.1.5",
    "hexo-generator-category": "^0.1.3",
    "hexo-generator-index": "^0.2.1",
    "hexo-generator-multiple-podcast": "^0.9.5",
    "hexo-generator-tag": "^0.2.0",
    "hexo-renderer-ejs": "^0.3.1",
    "hexo-renderer-markdown-it": "^4.1.0",
    "hexo-renderer-stylus": "^0.3.3",
    "hexo-server": "^0.3.3"
  }
}

Others