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How does Bing handle JavaScript? WhatвЂ™s the rendering process?Д«ing uses a headless browser and a crawl queue, which later renders content. As the web shifted towards being more JavaScript-heavy, the need to render a higher percentage of pages increased. The Bing team started working on JavaScript in 2011 with the idea that a limited portion (~5%) of the web would need to be rendered. This will dilute signaling and potential impact of the URL.

If old pages are blocked within the robots.txt, the blocked URL will remain within the index.

Not blocking search engines from resources needed to understand a webpage.

If both pages are the same, both will be crawled and indexed.

If the crawler sees itвЂ™s the same target again and again, then it may treat it as 301 anyway.вЂќ 302 targets donвЂ™t receive signals from the source, since they are supposed to be temporary and we donвЂ™t want to dilute signal.

A follow-up tweet from Dubut represents BingвЂ™s 302 process best, вЂњWe interpret 301 vs.

When a site uses a 301 redirect, the system treats it as permanent and shifts the scoring signal to the updated URL.

Leveraging 301 redirects for permanent moves (302 redirects are only for temporary redirects).

In the second portion of DubutвЂ™s talk, he reiterated the importance of: How does BingвЂ™s crawler function (at a very abstract level)?

During major URLs shifts, allow roughly two weeks to recrawl everything (as URL shifts are going to temporarily double crawl demand).

Since each bottleneck has its own crawl budget вЂ“ monitor budget for each property, domain and IP (or IP range).

If leveraging a separate mobile configuration, consider responsive web design.

Consider performance optimization for heavy, slow pages.

Remove any junk URLs or unused resources.

Remove duplicate content or leverage canonical tags.

Rejecting malicious actors through server-side security work.

Author side note : GoogleвЂ™s documentation on changing GooglebotвЂ™s crawl rates.

If you want to modify the time and rate of BingвЂ™s crawler, use the Bing Webmaster Tools Crawl Control report (refer to the Configure My Site section).

The hardest websites to crawl are those that are large and have poor SEO, meaning that the budget is less than the demand (need to be crawled). When should you be worried about the budget?Дubut mentioned that there are two elements that make websites more challenging to crawl: size and optimization level (think: internal linking infrastructure, low duplicate content, strong signaling, etc.). It is determined through the iterative process of evaluating the metrics listed. To be crawled, all of these levels must have room within their crawl budget.Д¬rawl budget is how much the crawler thinks it can crawl without hurting your site performance. Each bottleneck layer has its own, independent crawl budget.

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It uses signals (e.g., connection errors, download time, content size, status, etc.) to test the water and ensure that there are no anomalies. The crawl manager reviews multiple levels. What вЂsignalsвЂ™ does the crawl manager use? And when it still hasnвЂ™t identified a point of diminishing return, it will continue to increase the crawling. When the crawl manager senses that itвЂ™s crawling too much, it will back off crawling. Its job is to estimate and determine вЂњhow much it can crawl a site without hurting the siteвЂ™s performance?вЂќ (also called informally, вЂњcrawl budgetвЂќ). Like most good supervisors, the crawl managerвЂ™s job is to listen to signals and set a budget. A crawler can (if they visit a server too often) degrade the performance of a website (i.e., slow down).ДЄt the end of the day, search engines want crawlers to be вЂњgood citizen of the Internet.вЂќД¬rawl manager to the rescue! What is a crawl manager? Dubut stressed that building a program to visit sites and fetch information is simple, building them to be polite вЂ“ not so much. To better visualize, think large stores of computers sending a program to download content. What is a crawler?ДЄ crawler (also called a spider or bot) fetches HTML on the Internet for indexing.

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Last week, FrГ©dГ©ric Dubut, senior program manager at Microsoft, broke down each concept for us at SMX East and explained how to optimize a site for crawl efficiency. Yet, when youвЂ™re in SEO, understanding how spiders crawl, index and render pages is vital to ensuring a siteвЂ™s ability to flourish.

LetвЂ™s face it вЂ“ spiders are intimidating.

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