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Questions tagged [performance]

For questions with regard to the performance (as in time) of the features of the network.

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32 votes
1 answer
960 views

Degraded Stack Exchange network performance

Subject should say it all, but overall the Stack Exchange network has been very laggy (so far) all day on, February 27th and 28th. I am connecting from Brooklyn, NY, USA is happening on my home ISP ...
5 votes
0 answers
139 views

Long loading time on reputation page

When I open my Stack Overflow profile page (when logged in) it takes a long time for the page to load. The first request takes at least 7 seconds. This is easily reproducible. It happens in all ...
4 votes
1 answer
146 views

Improve load speed of side nav links on blog, or include loading indicator

When visiting the blog I noticed that it takes a long time for pages to load when clicking on the links in the left navigation sidebar. In addition, there is no visual indicator that anything is ...
10 votes
1 answer
179 views

Performance: could the "Responses" tab get a bit of optimization love?

Jeff tweeted this morning about recent performance work, and I dare say lots of bits have been getting faster - but since the recent "envelope change", getting to responses has been really slow. It's ...
6 votes
0 answers
125 views

HTML document for SE websites loading extremely slow on Firefox and Chromium

A 35-50kB HTML document on many Stack Exchange website pages including Stack Overflow is taking 10+ seconds to load. Please see screenshots for evidence. Please note that the issue is intermittent. ...
8 votes
0 answers
102 views

Comment getting posted twice

Right now, I am working on a speed-"unreliable" network connection. Sometimes, when I comment on a post, and network is unusually slow, after some time that same comment gets posted twice. ...
2 votes
0 answers
84 views

Page download speed of Stack Overflow. What's the tech and trick? [duplicate]

I am baffled by the way Stack Overflow pages are loaded. Even through a mobile connection.(Where download speed is 8kbps & I am not talking about the mobile site. I am taking about using the ...
18 votes
2 answers
7k views

Stack Overflow DB performance and redis cache

I am trying to understand some of the data storage and caching details of Stack Overflow. Are the pages build completely from redis cached data or does it need to make some db calls? Assuming that ...
13 votes
2 answers
150 views

Improve performance of SO/SF/SU flair

I have the flair from the three sites (Stack Overflow, Server Fault, Super User) on my site. I have been doing some performance optimisations of my website and the flair are being identified by YSlow ...
5 votes
1 answer
233 views

Performance delay in editor when moving to a blank line

I initially thought this affected MSE only, but now I started to face the same issue on other SE sites. I've encountered/reproduced only on Stack Exchange on Firefox for Win 10. Place cursor at the ...
32 votes
0 answers
247 views

Review queues architecture wrap up

The planned work on Review Queues includes Backend Architecture changes (listed on our Public Platform roadmap for February). As this project is now concluded, I would like to report to the Community ...
5 votes
3 answers
171 views

I am wearing a hat on Stack Overflow, but when I update the page it does not appear immediately

I have a mask for my avatar on the Stack Overflow website. However, when I go through Stack Overflow back and forth, for example, go home from the Questions tab, my mask does not appear on my avatar ...
19 votes
3 answers
1k views

Please don't completely remove the mobile website, for the benefit of users on slow connections

A Stack Exchange employee just said the following regarding the mobile site: We are actively working on the responsive design that works on both desktop and mobile, based on screen size. Once that is ...
18 votes
1 answer
1k views

Scrolling on Stack Overflow is slow if a question has lots of answers

Chrome Version: Google Chrome 70.0.3538.77 (Official Build) (64-bit) OS: Ubuntu Try opening one of these pages: How do I create a URL shortener? How to use a decimal range() step value? ...
145 votes
4 answers
3k views

Ads on SE sites are excessively animated, irrelevant, dubious and resource-intensive

SE had very high standards for ads on Stack Overflow, ads were curated, generally static images and well-behaved. I found the stance SE took on acceptable ads admirable, and they certainly left some ...
5 votes
0 answers
103 views

Stack Exchange JavaScript is taking much longer to load than usual

After the recent SE network outage, I noticed that the JavaScript that powers things like the vote buttons, the dropdowns, and the "add comment" button takes much longer to load than it did in the ...
12 votes
2 answers
214 views

Slowdown on SO and meta? [closed]

Is anyone else seeing SO and meta responding very slowly when clicking links, etc? I thought perhaps it was issues with my ISP at home, but I'm seeing the same sort of problems at work. Periodically ...
16 votes
0 answers
181 views

Review spring cleaning: performance improvements and responsive design

This is just a heads-up that there's a lot of work underway right now on the Review system, mostly in the areas of cleanup and bug-fixing. The review system we have now was originally built over the ...
11 votes
1 answer
411 views

User profile page takes 15-20 SECONDS to load on first load in X minutes

When I come to Stack Overflow, I typically do so through a link to my reputation tab so I can see any uncommented downvotes on my posts and try to correct whatever problem/error those votes are ...
3 votes
0 answers
29 views

Resizing user icon on the server side in users page

Today I noticed that a user's page shows a lot of user icons scaled from the very biggest ones. E.g. rene's icon original size is 652'832 bytes, but actually it's scaled from 512 pixels × 512&...
2 votes
0 answers
65 views

Stack Exchange Sites Loading Very Slowly

I'm seeing something consistent but odd lately. For the past several weeks, accessing various stack exchange sites from home, sometimes a simple refresh of the page causes very slow load times. While ...
9 votes
1 answer
63 views

Performance hit when editing a quesiton

We have a question on Code Review, that when editing causes the browser to become unresponsive. And for me, it causes Firefox to say the script is unresponsive and asks if I wish to kill it: Warning: ...
3 votes
2 answers
428 views

Why isn't the main Stack Overflow site fully W3C standards compliant?

The W3C validator reports errors when the Stack Overflow homepage is run through it. Simple fixes, like wrapping CDATA sections inside scripts, get around a lot of errors. Does the team use any ...
10 votes
0 answers
156 views

'all actions' tab of some users' profiles takes forever to load

When attempting to view the 'all actions' tab on some users' profiles, the page takes forever to load. For instance, attempting to load Fred -ii-'s 'all actions' tab takes just about 2 seconds. For ...
11 votes
0 answers
69 views

Cache (or otherwise speed up) /admin/users

When I load /admin/users on SO, I generally get a muffin or something while waiting: Those first two XHR requests (to load the all-time users-with-flagged-posts list and the 30 day one, respectively) ...
5 votes
1 answer
91 views

Mobile chat: Selecting a message is very CPU-intensive under Firefox for Android, top bar animation likely culprit

On both my Nexus 5X and Nexus 9 running Firefox, selecting a message in the new mobile chat interface is extremely slow, pegging one CPU core for several seconds before the options appear in the top ...
11 votes
0 answers
77 views

Extremely long load times for flag history page

Somewhat recently (as in the few days), the flag history summary became extremely slow on Stack Overflow (direct link to mine for devs), and proportionately longer on other sites: On SR, I saw a ...
2 votes
1 answer
104 views

UI freezes randomly in iOS app 1.2.1

I just upgraded to iOS app 1.2.1. While I like the feature enhancements, I find that it is unusable. On a couple of occasions, an action such as upvoting raised a dialog box saying that the network ...
39 votes
7 answers
5k views

cdn.sstatic.net is slowing down initial page loads

I'm located in Sydney, Australia and on my first hit to any Stack Exchange site after I haven't been active for a period of time (say, an hour or so), I can see FireFox waiting on cdn.sstatic.net for ...
9 votes
0 answers
167 views

User flair image issue on hover

When hovering a user's image and their flair shows up (ex: on any review page or on a question where someone other than the OP has most recently edited the question), the flair is requested after the ...
4 votes
1 answer
580 views

Why are Stack Exchange websites, especially Stack Overflow, much too slow?

Stack Exchange websites like Stack Overflow are sometimes very slow. Why is that? I can hardly even enter the website. Does anyone else have this problem too? My "Current" status: and sometimes It'...
12 votes
1 answer
189 views

Long load times on 10K tools ("flagged posts")

In the last few days I've noticed that the "Flagged Posts" page has gone from loading instantly to hanging for 10-15 seconds before loading. This is the only page on the SO site on which I am seeing ...
21 votes
1 answer
198 views

Major speed issues across the network?

Starting about 40 minutes ago (~13:45 GMT 3 November), SO, SE, and MSE at least all seem to be really slow. I'm not seeing issues with non-SE sites (not that that's scientific). Is there some network ...
8 votes
1 answer
602 views

Why does Stack Exchange use separate databases for each network site?

There are reasonable reasons for why separate sites are appropriate for Stack Exchange according to what it aims to be, and some of them are discussed here : Why is Stack Exchange split into multiple ...
5 votes
2 answers
3k views

How do people answer questions so quickly?

Even on the least active SE site I use people always provide answers before I've even finished searching to make sure it's not duplicate and is properly tagged/marked up. How is this possible? Are ...
2 votes
0 answers
95 views

Is Stack Exchange experimenting with KaTeX? [duplicate]

KaTeX is a new TeX-to-web renderer that is supposed to be faster and more lightweight than MathJax. Normally, I would just dismiss it as an interesting technology that might not be ready for ...
17 votes
0 answers
301 views

Why does sstatic.net serve cookies?

According to sstatic.net: This is a fast, cookieless domain intended for static content delivered to the Stack Exchange family of websites However, all responses from the server set a cookie anyway: ...
52 votes
1 answer
607 views

The deeper you dig, the longer you wait

10K users have the ability to see the full history of reviews (e.g. suggested edits history - users with less than 10K will just see their own reviews), on all queues - from the very first review ever....
2 votes
0 answers
38 views

What are the tricks that make stackexchange's pagespeed that fast? [duplicate]

I seriously think that one of the main secrets of this site's success is that it loads pages very fast. Unlike other websites, I don't have to wait much when having to visit to StackExchange websites. ...
3 votes
0 answers
25 views

Review Section is lately very slow [duplicate]

I've notices in the last weeks that the StackOverflow Review Section became very slow. It takes several seconds to load and from time to time it doesn't load at all. Did you notice the same? I don't ...
-17 votes
2 answers
187 views

Questions getting closed too fast (within hours). Give it some time to live [duplicate]

Possible Duplicate: Let questions stay open for a minimum amount of time before being closed? This is has happened to me a few times, and it's getting annoying. I post a question, sometimes for ...
0 votes
1 answer
82 views

Suggestion for Question Tagged "Performance" et al

As with suggestions given when a question is deemed to be subjective and a warning given, should the same not be done with question on performance? I have noticed that with pretty much every single ...
7 votes
2 answers
1k views

"StackOverflow is fast. Very, very fast." Why and how?

In the "About" section of SO, it says that it is "Fast. Very, very fast." What is it that makes it so fast? DB? MVC? What?
6 votes
0 answers
72 views

Is Stack Exchange having performance/response issues? [closed]

Are there any known performance issues with Stack Exchange (Stack Overflow in particular) right now? I've noticed over the last several weeks at random times of the day, I get slow responses or ...
4 votes
1 answer
68 views

Is the close tab in tools timing out?

In the 10k-tools when I visit the close tab I get a 500 response in the network trace and the Close votes category stays empty. Is it timing out (you do notice that selecting 14d, 7d, 2d or today ...
1 vote
0 answers
39 views

Very low performance of SO close review queue when using filtering by tag [duplicate]

I've just altered the tag filter in close review queue on StackOverflow to dojo, because questions tagged dojo and not javascript were normally skipped by my filter. Unfortunatelly, the next question ...
27 votes
0 answers
279 views

Loading next item from the close vote queue takes longer and longer

As a regular close vote review tasks handler I'm pretty used to the user experience, including the performance of load times of the next review task. When reviewing close votes I'm always filtered on ...
24 votes
1 answer
572 views

Will Stack Exchange support SPDY?

SPDY is an alternative protocol to HTTP that is specifically designed to reduce page load times. I heard that Google Chrome, Firefox, and Internet Explorer 11 support it. Google uses it to load pages. ...
8 votes
0 answers
130 views

Has something been recently done to speed up Stack Exchange sites?

In the past month or so, I've noticed that Stack Exchange sites have loaded in a half a heartbeat. I remember times when I had to wait for certain pages to load. Yet lately, everything I do has been ...
1 vote
2 answers
209 views

cdn.sstatic.net is having me stare at a plain white browser

Tried looking up "cdn.sstatic.net" on meta but found nothing recent. Whenever SO is slow to show up in the browser, it's because it's stuck waiting for "cdn.sstatic.net". Also in the most extreme ...