Web Performance Part 3 "Server-side tips"
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The presentation is devoted to server side tips on improving Web Performance. All 4 presentations will help you reduce latency, enrich optimization of javascript code, discover tricky parts when working with API browser, see best practices of networking and learn lots of other important and interesting things. Enjoy! =)
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Exceptional Behaviors: How Frequently Are They Tested? (AST 2025)Andre Hora Exceptions allow developers to handle error cases expected to occur infrequently. Ideally, good test suites should test both normal and exceptional behaviors to catch more bugs and avoid regressions. While current research analyzes exceptions that propagate to tests, it does not explore other exceptions that do not reach the tests. In this paper, we provide an empirical study to explore how frequently exceptional behaviors are tested in real-world systems. We consider both exceptions that propagate to tests and the ones that do not reach the tests. For this purpose, we run an instrumented version of test suites, monitor their execution, and collect information about the exceptions raised at runtime. We analyze the test suites of 25 Python systems, covering 5,372 executed methods, 17.9M calls, and 1.4M raised exceptions. We find that 21.4% of the executed methods do raise exceptions at runtime. In methods that raise exceptions, on the median, 1 in 10 calls exercise exceptional behaviors. Close to 80% of the methods that raise exceptions do so infrequently, but about 20% raise exceptions more frequently. Finally, we provide implications for researchers and practitioners. We suggest developing novel tools to support exercising exceptional behaviors and refactoring expensive try/except blocks. We also call attention to the fact that exception-raising behaviors are not necessarily “abnormal” or rare.
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Maxon Cinema 4D 2025 is the latest version of the Maxon's 3D software, released in September 2024, and it builds upon previous versions with new tools for procedural modeling and animation, as well as enhancements to particle, Pyro, and rigid body simulations. CG Channel also mentions that Cinema 4D 2025.2, released in April 2025, focuses on spline tools and unified simulation enhancements.
Key improvements and features of Cinema 4D 2025 include:
Procedural Modeling: New tools and workflows for creating models procedurally, including fabric weave and constellation generators.
Procedural Animation: Field Driver tag for procedural animation.
Simulation Enhancements: Improved particle, Pyro, and rigid body simulations.
Spline Tools: Enhanced spline tools for motion graphics and animation, including spline modifiers from Rocket Lasso now included for all subscribers.
Unified Simulation & Particles: Refined physics-based effects and improved particle systems.
Boolean System: Modernized boolean system for precise 3D modeling.
Particle Node Modifier: New particle node modifier for creating particle scenes.
Learning Panel: Intuitive learning panel for new users.
Redshift Integration: Maxon now includes access to the full power of Redshift rendering for all new subscriptions.
In essence, Cinema 4D 2025 is a major update that provides artists with more powerful tools and workflows for creating 3D content, particularly in the fields of motion graphics, VFX, and visualization.
Salesforce Data Cloud- Hyperscale data platform, built for Salesforce.
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Web Performance Part 3 "Server-side tips"
- 1. Web Performance Server-side Tips Andrew Kovalenko
- 2. Table of contents ➔ Nginx vs Apache ➔ Apache performance tuning ➔ Nginx performance tuning ➔ Web server accelerators ➔ Varnish ➔ PageSpeed module
- 3. Total number of websites NetCraft: http://news.netcraft.com/archives/2013/06/06/june-2013-web-server-survey-3.html
- 4. Web server developers: Market share of active sites NetCraft: http://news.netcraft.com/archives/2013/06/06/june-2013-web-server-survey-3.html
- 5. Nginx vs Apache (requests/seconds) Amazon EC2 Micro Instance Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz 613 MB RAM Ubuntu 13.10 index.html 612 B earth.png 3.7 MB
- 6. Nginx vs Apache (memory usage)
- 9. Frontend (Nginx) - backend (Apache) Front end Client Back end ➔ php ... Static content ➔ js ➔ css ➔ images ➔ video ...
- 10. Nginx config Light content (html, css, js, xml, rss, txt) Heavy content (photo, video, audio) ➔ g-zip compression ➔ expires headers for content proxy ➔ file descriptor caching ➔ virtual folder for frequently asked content ➔ SSD ➔ cache proxied requests worker_processes, worker_priority, worker_connections, sendfile on, access_log off, tcp_nopush on, gzip on
- 11. Apache config Run-TimeCompile-Time ➔ load only required modules ➔ choose appropriate MPM HTTP Compression & Caching ➔ AllowOverride ➔ FollowSymLinks and SymLinksIfOwnerMatch ➔ Content Negotiation ➔ MPM config ➔ KeepAlive and KeepAliveTimeout Accept-Encoding: gzip,deflate Separate Static RewriteCond for images Other configs
- 12. Web server accelerators Web server accelerator Compression Operating system Browser Caching Edge Side Includes Prefetching Optimize code Preemptive hostname resolution Ad removal Client aiCache Gzip Linux All Yes No Yes Yes Yes All Apache Traffic Server Linux CACHEbox None Linux All Yes No Yes No No Yes End user/ISP Ishlangu Gzip Linux All Yes No No Yes Yes No All LotServer None Linux, Windows All No No No No No No Content Provider nginx Gzip Unix All Yes No No No Yes No user/ISP Polipo None Unix, Windows All Yes No No No No No user/ISP SiteCelerate Text & Images All Yes No Yes No No No user/ISP Squid None Unix, Windows All Yes Yes No No No No user/ISP Varnish Gzip on-the-fly compression and decompression Unix All Yes Yes No No No If You want All Ziproxy Images, text & any gzippable data Unix All No No No HTML, JS, CSS Yes Yes ISP
- 13. Varnish
- 14. SPDY: PageSpeed module Supported platforms: ➔ CentOS/Fedora (32-bit and 64-bit) ➔ Debian/Ubuntu (32-bit and 64-bit) Apache 2.2 and higher Nginx 1.3.15 and higher, for lower versions build from sources
- 15. PageSpeed features ➔ Optimizing caching ➔ Minimizing round-trip times ➔ Minimizing request overhead ➔ Minimizing payload size ➔ Optimizing browser rendering ➔ Optimizing for mobile all by filters...
- 16. add_instrumentation Adds client-side latency instrumentation Head: window.mod_pagespeed_start = Number(new Date()); End body: pagespeed.addInstrumentationInit('/mod_pagespeed_beacon', 'load', '', 'http://www.modpagespeed.com/add_instrumentation.html');
- 17. combine_css
- 20. And a lot more ➔ collapse_whitespace ➔ combine_javascript ➔ dedup_inlined_images ➔ defer_javascript ➔ extend_cache ➔ extend_cache_pdfs ➔ inline_css ➔ inline_javascript ➔ inline_preview_images ➔ insert_dns_prefetch ➔ move_css_above_scripts ➔ move_css_to_head ➔ lazyload_images ➔ outline_css ➔ outline_javascript ➔ prioritize_critical_css ➔ remove_comments ➔ remove_comments ➔ remove_quotes ➔ resize_rendered_image_dimensions ➔ rewrite_css ➔ rewrite_javascript ➔ rewrite_style_attributes ➔ sprite_images ➔ trim_urls ➔ etc...