I’ve tried to include a wide variety of tools that are easy to use,
and have tried to keep them as OS and technology-independent as
possible so that everyone can find a tool or two.

1. YSlow for Firebug

YSlow grades a website’s performance based on the best practices for high performance web sites
on the Yahoo! Developer Network. Each rule is given a letter grade (A
through F) stating how you rank on certain aspects of front-end
performance. It’s a simple tool for finding things you can work on such
as reducing the number of HTTP request a web page makes, and
compressing external JavaScript and CSS files. A worthwhile read is the
Ajax performance analysis post on IBM developerWorks that outlines practical ways of using YSlow in your web applications.

2. Firebug

Firebug is an essential browser-based web development tool
for debugging, testing, and analyzing web pages. It has a powerful set
of utilities to help you understand and dissect what’s going on. One of
the many notable features is the Net (network”) tab where you can
inspect HTML, CSS, XHR, JS components.

3. Fiddler 2

Fiddler 2 is a browser-based HTTP debugging tool that helps
you analyze incoming and outgoing traffic. It’s highly customizable and
has countless of reporting and debugging features. Be sure to read the “Fiddler PowerToy – Part 2: HTTP Performance”
guide on the MSDN which discusses functional uses of Fiddler including
how to improve “first-visit” performance (i.e. unprimed cache),
analyzing HTTP response headers, creating custom flags for potential
performance problems and more.

4. Cuzillion

Cuzillion is a cool tool to help you see how page
components interact with each other. The goal here is to help you
quickly rapidly check, test, and modify web pages before you finalize
the structure. It can give you clues on potential trouble-spots or
points of improvements. Cuzillion was created by Steve Saunders,
the ex-Chief Performance at Yahoo!, a leading engineer for the
development of Yahoo’s performance best practices, and creator of YSlow.

5. mon.itor.us

monitor.us is a free web-based service that grants you a
suite of tools for monitoring performance, availability, and traffic
statistics. You can establish your website’s response time and set up
alerts for when a service becomes unavailable. You can also set-up
weekly, automated benchmarks to see if changes you’ve made impact speed
and performance either positively or negatively.

6. IBM Page Detailer

The IBM Page Detailer is a straightforward tool for letting
you visualize web components as they’re being downloaded. It latches
onto your browser, so all you have to do is navigate to the desired
site with the IBM Page Detailer open. Clicking on a web page component
opens a window with the relevant details associated with it. Whenever
an event occurs (such as a script being executed), the tool opens a
window with information about the processes.

7. Httperf

Httperf is an open-source tool for measuring HTTP server
performance running on Linux. It’s an effective tool for benchmarking
and creating workload simulations to see if you can handle high-level
traffic and still maintain stability. You can also use it to figure out
the maximum capacity of your server, gradually increasing the number of
requests you make to test its threshold.

8. Pylot

Pylot is an open-source performance and scalability testing
tool. It uses HTTP load tests so that you can plan, benchmark, analyze
and tweak performance. Pylot requires that you have Python installed on
the server – but you don’t need to know the language, you use XML to
create your testing scenarios.

9. PushToTest TestMaker

PushToTest TestMaker is a free, open-source platform for
testing scalability and performance of applications. It has an
intuitive graphical user interface with visual reporting and analytical
tools. It has a Resource Monitor feature to help you see CPU, memory,
and network utilization during testing. The reporting features let you
generate graphs or export data into a spreadsheet application for
record-keeping or further statistics analysis.

10. Wbox HTTP testing tool

Wbox is a simple, free HTTP testing software released under
the GPL (v2). It supports Linux, Windows, and MacOS X systems. It works
by making sequential requests at desired intervals for stress-testing.
It has an HTTP compression command so that you can analyze data about
your server’s file compression. If you’ve just set up a virtual domain,
Wbox HTTP testing tool also comes with a command for you to test if
everything’s in order before deployment.

11. WebLOAD

WebLOAD is an open-source, professional grade stress/load
testing suite for web applications. WebLOAD allows testers to perform
scripts for load testing using JavaScript. It can gather live data for
monitoring, recording, and analysis purposes, using client-side data to
analyze performance. It’s not just a performance tool – it comes with
authoring and debugging features built in.

12. DBMonster

DBMonster is an open-source application to help you tune
database structures and table indexes, as well as conduct tests to
determine performance under high database load. It’ll help you see how
well your database/s will scale by using automated generation of test
data. It supports many databases such as MySQL, PostgreSQL, Oracle,
MSSQL and (probably) any database that supports the JDBC driver.

13. OctaGate SiteTimer

The OctaGate SiteTimer is a simple utility for determining
the time it takes to download everything on a web page. It gives you a
visualization of the duration of each state during the download process
(initial request, connection, start of download, and end of download).

14. Web Page Analyzer

The Web Page Analyzer is an extremely simple, web-based
test to help you gain information on web page performance. It gives you
data about the total number of HTTP requests, total page weight, your
objects’ sizes, and more. It tries to estimate the download time of
your web page on different internet connections and it also enumerates
each page object for you. At the end, it provides you with an analysis
and recommendation of the web page tested – use your own judgment in
interpreting the information.

15. Site-Perf.com

Site-Perf.com is a free web-based service that gives you
information about your site’s loading speed. With Site-Perf.com’s tool,
you get real-time capturing of data. It can help you spot bottlenecks,
find page errors, gather server data, and more – all without having to
install an application or register for an account.

More Tools and Related Resources

• Apache JMeter

  a Java-based desktop application for performance testing Apache servers.

• The Grinder

  an open-source load testing framework that intends to make automated tests simpler.

• OpenWebLoad
  

  yet another excellent open-source load testing tool for web applications.

• “Optimizing Page Load Time”

  an article on improving page load time.

• “What the 80/20 Rule Tells Us about Reducing HTTP Requests”

  a blog post on the YUI blog explaining the precedence of front-end performance for optimal response times.

If you have a favorite web performance tool that wasn’t on the list,
share it in the comments. Would also like to hear your experiences,
tips, suggestions, and resources you use.

And if you’re interested in analyzing the effectiveness of a web page design, be sure to check out 7 Incredibly Useful Tools for Evaluating a Web Design.

before i start, this is just a selection of some of the steepest streets on earth. i’m sure i’ve probably missed out a few corkers. let me know and i’ll maybe add them. also, to explain the grade percentage: as an example, a road with a 30% grade would rise 30 feet in height for every 100 feet travelled horizontally.

1. canton avenue, pittsburgh, united states – grade = 37%

officially not the steepest street in the world, canton avenue is actually steeper than the current world record holder, baldwin street in new zealand. for that very good reason alone i’m sticking it at the top.

it’s not a very long road but if you check out the cyclist’s face in the photo below you’ll see that it’s definitely long enough.

2. baldwin street, dunedin, new zealand – grade = 35%

the current world record holder of ’steepest street in the world’, baldwin street is famous for its slope. it was previously thought that the road’s gradient hit 38% near the top but that was apparently a mistake.

if handbrakes could sob there’d be a stream of tears running down the road in the photo below.

the clip below consists of a pretty annoying guy on a segway attempting to ride up the slope. unfortunately he makes it.

3. eldred street, los angeles, united states – grade = 33.3%

the guy in the photo below looks thoroughly depressed and you can’t blame him. he lives in los angeles. add to that equation the fact that he lives on the steepest street in the city and you’ve got a recipe for disaster.

there’s a los angeles times article about the street here.

4. fargo street, los angeles, united states – grade = 32%

fargo street in 1930…

once a year around 90 mentalists gather at the base of fargo street in los angeles for the fargo street hill climb. they then attempt to scale the hill on a bicycle as many times as humanly possible in a day.

this year the winner was a guy called steve gilmore and he managed it 92 times, in the process climbing around 14′000ft in only 15 miles.

watch this clip and feel the pain…

sources: 1, 2, 3, 4, 5

Looking and sounding fit, Hans Schlegel joined Rex Walheim in removing a depleted nitrogen tank from the space station and installing a full one weighing 550 pounds. The high-pressure nitrogen gas is needed to flush ammonia through the station’s cooling lines.

When the new tank was powered up, Mission Control radioed the news along with congratulations for the spacewalkers’ “great work.”

Schlegel, 56, was supposed to go out on the first spacewalk of the mission to help hook up Europe‘s space station lab, Columbus, which was ferried up by Atlantis. But he became ill after reaching orbit last week.

Court Dismisses Secret Flight Suit

SAN FRANCISCO — A federal judge dismissed a lawsuit that accused a unit of Boeing of helping to fly terrorism suspects abroad to secret prisons because “the very subject matter of the case is a state secret.” “At the core of plaintiffs’ case . . . are ‘allegations’ of covert U.S. military or CIA operations in foreign countries against foreign nationals — clearly a subject matter which is a state secret,” Judge James Ware wrote in his ruling. The American Civil Liberties Union‘s lawsuit accused Jeppesen Dataplan of providing flight and logistical support to the U.S. government on 70 “extraordinary-rendition” flights.

Yahoo would be attractive to News Corp analysts suggest.

Rupert Murdoch’s News Corporation is reportedly in talks with Yahoo about a possible deal that would stave off an approach from Microsoft. The Wall Street Journal said that News Corp was eyeing a move that would see MySpace and other of Murdoch’s web interests merge with Yahoo.

Yahoo would give News Corp 20% of its shares under the alleged deal, allowing it to remain independent.

Microsoft has offered to buy Yahoo for more than $40bn (£20.5bn).

However Yahoo has dismissed the move as undervaluing its brand, audience, investments in advertising platforms and future growth prospects, free cash flow and earnings potential.

Google challenge

In a letter outlining why it had spurned the offer, Yahoo chief executive Jerry Yang said that the firm was in a position to take advantage of “a huge market opportunity”.

“Today, Yahoo is a faster-moving, better-organized, more nimble company than it was just a few months ago,” Mr Yang said.

“We have redeployed our resources to drive Yahoo’s key strategic priorities taking important steps to streamline our organisation and close down or scale back businesses that don’t support these critical growth initiatives.”

Microsoft wants to merge with Yahoo to increase its online presence and enable it to better compete with industry leader Google.

It has said that Yahoo rejecting its offer, worth $31 a share, 62% above the level at which Yahoo stocks were trading when the offer was made on 1 February, was “unfortunate”.

News Corp’s media interests include Dow Jones – which publishes the Wall Street Journal – Fox News, BSkyB, The Sun and The Times as well as MySpace.