Why does the performance differ so greatly with seemingly the same code?

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Why does performance differ when the only difference is in code paths that are not executed?

Test1 below is consistently 10% faster than Test2, although I'm always calling the method with a 0 argument, so the stuff that's inside the switch case - the only difference - is never being executed. Btw after copy-and-pasting the code into a brand new project, only changing the test function's name to Main, the results are reversed. Every time I run that project, Test2 is faster. So what are the factors involved in making this slower and faster? And: Can I influence performance deliberately...

Answer:

Benchmarking is a fine art, it is very difficult to reliably measure very fast code like this. In general...

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Eugene Beresovsky at Stack Overflow Mark as irrelevant Undo

Other solutions

Does JavaScript performance on Windows machines differ from JavaScript performance on Macs?

I know there are browser differences in terms of performance, but are there operating system comparisons or is it purely a matter of hardware?

Answer:

JavaScript performance is almost completely derived from the JavaScript engine running in the browser...

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Rick Waldron at Quora Mark as irrelevant Undo

Does inefficient code cripple the performance of an app?

I am not a programming geek, so I could easily foresee writing an app with long lines of code. I was wondering whether there is any difference in performance between smartly-written code and amateur code.

Answer:

It depends on whether your app is performance-sensitive.  For example, code on a web server where multiple...

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Rob Weir at Quora Mark as irrelevant Undo

ASP.NET Webform: inline code (<%= %> ) vs Server Control Performance?

Let's forget about state management, maintenance perspective, etc ... and focus on render performance only Which of render method has better performance ? <%= ... %> or Server Control (or  Html Server Control/ Custom Control/ UserControl) ? e...

Answer:

This is actually an apples-to-oranges comparison. Render-time-wise, Server Controls will always render...

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Memi Lavi at Quora Mark as irrelevant Undo

If C and C++ give the best performance, why do we still code in other languages?

If we compare the performance of a couple of major languages like C, C++, Perl, C#, Java, PHP, and Ruby, then we find that the best performance is given by C or C++, then why do we still code in languages other than C or C++ ? For reference look at this...

Answer:

TL;DR:The primary limitation on software is not the speed of computers but our ability to get our heads...

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Toby Thain at Quora Mark as irrelevant Undo

C# code and SQL procedure performance question.?

Hi Friends, I am doing following things. 1) I am pushing 50 rows into a SQL table every 1 Min. 2) At same time, I am retrieving 180 Rows of data from same table based on primary key, using Views. 3) Now, from 180 Rows, I have to loop and find out open...

Answer:

I can tell you from personal experience that any record operations are quicker at the database level...

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maverick at Yahoo! Answers Mark as irrelevant Undo

How does Box differ from Dropbox in terms of technology use, performance, and user-friendliness?

My employer offers accounts via http://box.com now, and as I have installed it I see it uses davfs2.  We are also offered a quite generous storage limit (compared to other free alternatives). But how does the solution differ in terms of technology? How...

Answer:

I can offer some responses for 1, 2 & 4. In my experience Dropbox syncs better. I say this with...

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Dan Wilson at Quora Mark as irrelevant Undo

How do i know if my 1967 mustang is a K-Code (high performance)?

i have a 1967 289 mustang and i have no idea if my engine is a k-code or not. and to tell the truth im not sure how to tell if it is or not. so will someone please help me. how do i know if my car is high performance or not

Answer:

The fifth digit in the vin (left inner fender) tells it all: C plain jane 289 two barrel 200hp A four...

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clemsond... at Yahoo! Answers Mark as irrelevant Undo

How would I fix engine code P0008 Engine Positions System Performance Bank 1?

I have a 2007 Dodge Caliber with just under 30,000 miles on it and the check engine light came on. I pulled the code and it was P0008 which is engine positions system performance ...show more

Answer:

im not real sure,aint that about your fuel trim

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XMI6MJDGNY6RZKUMKDD2GHVRMY at Yahoo! Answers Mark as irrelevant Undo

Does disabling a graphical desktop significantly improve the performance of CUDA code?

Presumably some of the GPU's resources are occupied by the graphical display (if this device is being used for both a CUDA executable and for display).  Just wondering if dropping down to the basic terminal interface and disabling the graphical desktop...

Answer:

This is very interesting question. The answer depends a lot on two factors. 1) GPU in use 2) The OS...

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Ashutosh Dhar at Quora Mark as irrelevant Undo

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