我一直在使用Pingdom对我的网站性能进行一些分析，并监视加载速度以及出现的任何其他问题。
我注意到我有一些机会可以通过压缩请求和交付的数据来提高网站的性能。
我的第一步是使用我的.htaccess文件来设置我想要缓存和压缩的内容。以H5PB作为起点，将其添加到文件中：
# ######################################################################
# # WEB PERFORMANCE #
# ######################################################################
# ----------------------------------------------------------------------
# | Compression |
# ----------------------------------------------------------------------
<IfModule mod_deflate.c>
# Force compression for mangled `Accept-Encoding` request headers
#
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Encoding
# https://calendar.perfplanet.com/2010/pushing-beyond-gzipping/
<IfModule mod_setenvif.c>
<IfModule mod_headers.c>
SetEnvIfNoCase ^(Accept-EncodXng|X-cept-Encoding|X{15}|~{15}|-{15})$ ^((gzip|deflate)\s*,?\s*)+|[X~-]{4,13}$ HAVE_Accept-Encoding
RequestHeader append Accept-Encoding "gzip,deflate" env=HAVE_Accept-Encoding
</IfModule>
</IfModule>
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# Compress all output labeled with one of the following media types.
#
# https://httpd.apache.org/docs/current/mod/mod_filter.html#addoutputfilterbytype
<IfModule mod_filter.c>
AddOutputFilterByType DEFLATE "application/atom+xml" \
"application/javascript" \
"application/json" \
"application/ld+json" \
"application/manifest+json" \
"application/rdf+xml" \
"application/rss+xml" \
"application/schema+json" \
"application/vnd.geo+json" \
"application/vnd.ms-fontobject" \
"application/wasm" \
"application/x-font-ttf" \
"application/x-javascript" \
"application/x-web-app-manifest+json" \
"application/xhtml+xml" \
"application/xml" \
"font/collection" \
"font/eot" \
"font/opentype" \
"font/otf" \
"font/ttf" \
"image/bmp" \
"image/svg+xml" \
"image/vnd.microsoft.icon" \
"image/x-icon" \
"text/cache-manifest" \
"text/calendar" \
"text/css" \
"text/html" \
"text/javascript" \
"text/plain" \
"text/markdown" \
"text/vcard" \
"text/vnd.rim.location.xloc" \
"text/vtt" \
"text/x-component" \
"text/x-cross-domain-policy" \
"text/xml"
</IfModule>
# ----------------------------------------------------------------------
# | ETags |
# ----------------------------------------------------------------------
# Remove `ETags` as resources are sent with far-future expires headers.
#
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag
# https://developer.yahoo.com/performance/rules.html#etags
# https://tools.ietf.org/html/rfc7232#section-2.3
# `FileETag None` doesn't work in all cases.
<IfModule mod_headers.c>
Header unset ETag
<filesmatch "\.(ico|flv|gif|swf|eot|woff|otf|ttf|svg)$">
Header set Cache-Control "max-age=2592000, public"
</filesmatch>
<filesmatch "\.(jpg|jpeg|png)$">
Header set Cache-Control "max-age=1209600, public"
</filesmatch>
<filesMatch "\.(css)$">
Header set Cache-Control "max-age=604800, public"
</filesMatch>
<filesMatch "\.(js)$">
Header set Cache-Control "max-age=216000, private"
</filesMatch>
</IfModule>
FileETag None
# ----------------------------------------------------------------------
# | Cache expiration |
# ----------------------------------------------------------------------
# Serve resources with far-future expiration date.
#
# (!) If you don't control versioning with filename-based
# cache busting, you should consider lowering the cache times
# to something like one week.
#
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expires
# https://httpd.apache.org/docs/current/mod/mod_expires.html
<IfModule mod_expires.c>
ExpiresActive On
ExpiresDefault "access plus 1 month"
# CSS
ExpiresByType text/css "access plus 1 year"
# Data interchange
ExpiresByType application/atom+xml "access plus 1 hour"
ExpiresByType application/rdf+xml "access plus 1 hour"
ExpiresByType application/rss+xml "access plus 1 hour"
ExpiresByType application/json "access plus 0 seconds"
ExpiresByType application/ld+json "access plus 0 seconds"
ExpiresByType application/schema+json "access plus 0 seconds"
ExpiresByType application/vnd.geo+json "access plus 0 seconds"
ExpiresByType application/xml "access plus 0 seconds"
ExpiresByType text/calendar "access plus 0 seconds"
ExpiresByType text/xml "access plus 0 seconds"
# Favicon (cannot be renamed!) and cursor images
ExpiresByType image/vnd.microsoft.icon "access plus 1 week"
ExpiresByType image/x-icon "access plus 1 week"
# HTML
ExpiresByType text/html "access plus 0 seconds"
# JavaScript
ExpiresByType application/javascript "access plus 1 year"
ExpiresByType application/x-javascript "access plus 1 year"
ExpiresByType text/javascript "access plus 1 year"
# Manifest files
ExpiresByType application/manifest+json "access plus 1 week"
ExpiresByType application/x-web-app-manifest+json "access plus 0 seconds"
ExpiresByType text/cache-manifest "access plus 0 seconds"
# Markdown
ExpiresByType text/markdown "access plus 0 seconds"
# Media files
ExpiresByType audio/ogg "access plus 1 month"
ExpiresByType image/bmp "access plus 1 month"
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/jpg "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"
ExpiresByType image/png "access plus 1 month"
ExpiresByType image/svg+xml "access plus 1 month"
ExpiresByType image/webp "access plus 1 month"
ExpiresByType video/mp4 "access plus 1 month"
ExpiresByType video/ogg "access plus 1 month"
ExpiresByType video/webm "access plus 1 month"
# WebAssembly
ExpiresByType application/wasm "access plus 1 year"
# Web fonts
# Collection
ExpiresByType font/collection "access plus 1 month"
# Embedded OpenType (EOT)
ExpiresByType application/vnd.ms-fontobject "access plus 1 month"
ExpiresByType font/eot "access plus 1 month"
# OpenType
ExpiresByType font/opentype "access plus 1 month"
ExpiresByType font/otf "access plus 1 month"
# TrueType
ExpiresByType application/x-font-ttf "access plus 1 month"
ExpiresByType font/ttf "access plus 1 month"
# Web Open Font Format (WOFF) 1.0
ExpiresByType application/font-woff "access plus 1 month"
ExpiresByType application/x-font-woff "access plus 1 month"
ExpiresByType font/woff "access plus 1 month"
# Web Open Font Format (WOFF) 2.0
ExpiresByType application/font-woff2 "access plus 1 month"
ExpiresByType font/woff2 "access plus 1 month"
# Other
ExpiresByType text/x-cross-domain-policy "access plus 1 week"
</IfModule>
在查看我的网站对这些更改的响应方式以及它如何影响我的效果之后，我注意到我仍然在我的网站上收到这些建议：
F 0
Use a Content Delivery Network (CDN)
F 1
Add Expires headers
F 34
Configure entity tags (ETags)
D 67
Compress components with gzip
B 80
Make fewer HTTP requests
B 80
Use cookie-free domains
B 85
Reduce DNS lookups
接下来，我开始查看是否需要更改动态文件中以php发送的某些标头，因此将其添加到我的所有html / php文件中：
$ts = gmdate("D, d M Y H:i:s") . " GMT";
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
header("Expires: $ts");
header("Last-Modified: $ts");
这对我所有的css / js文件：
header('Cache-Control: public');
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 86400) . ' GMT');
我什至竭尽所能缩小CSS / JS并从PHP输出HTML，并减少HTTP调用的负担，因为UI中呈现了base64_encoded图像。
总的来说，我已经能够减少HTML / CSS / JS的主要负载（是的！），但是，我的性能等级仍然在转储中：
Performance grade
C79/100
Load time
2.21S
Page size
1.37MB
Requests
21
关于我可能做错了什么的任何想法，或者我可以在哪里寻找下一个2.21S的想法？还是我什至有可能降低1.37MB的容量？