CodeMonkeys Meeting notes 2012-10-18

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Topic

Google's mod_pagespeed speeds up your site and reduces page load time. This open-source Apache HTTP server module automatically applies web performance best practices to pages, and associated assets (CSS, JavaScript, images) without requiring that you modify your existing content or workflow.

Links

• https://developers.google.com/speed/pagespeed/mod

Test Scenario Without mod_pagespeed

• Local Copy of midsouthmakers.org running on Ubuntu 12.04.1 LTS (GNU/Linux 3.2.0-27-generic x86_64) Virtual Machine (via Virtualbox)
  • 4 CPUs - 4,906 MB RAM
• Pointed local Windows hosts file to internal IP of VM.
• Firefox 16.0.1 + Firebug 1.10.4 + Page Speed 1.12.9
• Loaded midsouthmakers.org in Firefox, ran Analyzed index page via Page Speed and score was 82/100
  • Red Result:
    • Leverage browser caching
  • Yellow Results:
    • Serve resources from a consistent URL
    • Defer parsing of JavaScript
    • Serve scaled images

Test Scenario With mod_pagespeed

• Local Copy of midsouthmakers.org running in a 64bit Ubuntu Server 12.04 Virtual Machine (via Virtualbox)
  • 4 CPUs - 4,906 MB RAM
• Pointed local Windows hosts file to internal IP of VM.
• Firefox 16.0.1 + Firebug 1.10.4 + Page Speed 1.12.9
• Installed mod-pagespeed-stable_current_amd64.deb & restarted apache2
• Hard Refreshed midsouthmakers.org index, ran Analyzed index page via Page Speed and score was 83/100
  • Red Result:
    • Leverage browser caching
  • Yellow Results:
    • Serve resources from a consistent URL
    • Defer parsing of JavaScript

Further Configuration

• vi /etc/apache2/mods-available/pagespeed.conf
• Enabled ModPagespeedStatistics
• refresh a few times to simulate web traffic
• view midsouthmakers.org/mod_pagespeed_statistics

cache_time_us: 23271
cache_hits: 0
cache_misses: 116
cache_expirations: 42
cache_inserts: 42
cache_deletes: 0
instrumentation_filter_script_added_count: 0
cache_extensions: 336
not_cacheable: 0
css_file_count_reduction: 0
css_filter_blocks_rewritten: 6
css_filter_parse_failures: 0
css_filter_rewrites_dropped: 0
css_filter_total_bytes_saved: 462
css_filter_total_original_bytes: 1520
css_filter_uses: 27
css_imports_to_links: 0
css_elements_moved: 0
domain_rewrites: 0
google_analytics_page_load_count: 0
google_analytics_rewritten_count: 0
image_file_count_reduction: 0
image_rewrites: 0
image_rewrites_dropped_intentionally: 0
image_rewrites_dropped_due_to_load: 0
image_rewrite_total_bytes_saved: 0
image_rewrite_total_original_bytes: 0
image_rewrite_uses: 0
image_inline: 0
image_ongoing_rewrites: 0
image_webp_rewrites: 0
inserted_ga_snippets: 0
javascript_blocks_minified: 55
javascript_minification_failures: 0
javascript_total_bytes_saved: 2765
javascript_total_original_bytes: 20992
javascript_minify_uses: 55
js_file_count_reduction: 0
converted_meta_tags: 9
url_trims: 0
url_trim_saved_bytes: 0
resource_url_domain_rejections: 0
rewrite_cached_output_missed_deadline: 110
rewrite_cached_output_hits: 916
rewrite_cached_output_misses: 122
resource_404_count: 0
slurp_404_count: 0
total_page_load_ms: 0
page_load_count: 0
resource_fetches_cached: 0
resource_fetch_construct_successes: 0
resource_fetch_construct_failures: 0
num_flushes: 10
num_fallback_responses_served: 0
num_conditional_refreshes: 0
total_fetch_count: 0
total_rewrite_count: 0
num_rewrites_executed: 6
num_rewrites_dropped: 0
serf_fetch_request_count: 42
serf_fetch_bytes_count: 10583
serf_fetch_time_duration_ms: 2317
serf_fetch_cancel_count: 0
serf_fetch_active_count: 0
serf_fetch_timeout_count: 0
serf_fetch_failure_count: 0
cache_flush_count: 0

Pagespeed Resource Latency Histogram
>Raw Histogram Data...
Rewrite Latency Histogram
>Raw Histogram Data...
Backend Fetch First Byte Latency Histogram
>Raw Histogram Data...
Html Time us Histogram
>Raw Histogram Data...