Questions related to improving application performance, this can be range from selection software architecture to selection of algorithms.

learn more… | top users | synonyms (1)

158
votes
13answers
44k views

Should we avoid object creation in Java?

I was told by a colleague that in Java object creation is the most expensive operation you could perform. So I can only conclude to create as few objects as possible. This seems somewhat to defeat ...
130
votes
31answers
13k views

Is micro-optimisation important when coding?

I recently asked a question on Stack Overflow to find out why isset() was faster than strlen() in PHP. This raised questions around the importance of readable code and whether performance improvements ...
97
votes
11answers
31k views

What backs up the claim that C++ can be faster than a JVM or CLR with JIT? [closed]

A reoccurring theme on SE I've noticed in many questions is the ongoing argument that C++ is faster and/or more efficient than higher level languages like Java. The counter-argument is that modern JVM ...
68
votes
15answers
18k views

Why would it ever be possible for Java to be faster than C++?

Sometimes Java outperforms C++ in benchmarks. Of course, sometimes C++ outperforms. See the following links: http://keithlea.com/javabench/ ...
60
votes
7answers
10k views

Is a 1 < 10 comparison less expensive than 1 < 1000000?

I just used ~1 billion as the count for a z-index in CSS, and was thinking about the comparisons that must go on. Is there a difference in performance on the ALU level in comparisons between very ...
53
votes
9answers
7k views

Clean readable code vs fast hard to read code. When to cross the line?

When I write code I always try to make my code as clean and readable as possible. Every now and then there comes a time when you need to cross the line and go from nice clean code to slightly uglier ...
49
votes
1answer
8k views

Why are native ES6 promises slower and more memory-intensive than bluebird?

In this benchmark, the suite takes 4 times longer to complete with ES6 promises compared to Bluebird promises, and uses 3.6 times as much memory. How can a JavaScript library be so much faster and ...
48
votes
10answers
3k views

When does “proper” programming no longer matter?

I've been building an android game in my spare time. It's using the libgdx library so quite a bit of the heavy lifting is done for me. While developing, I carelessly selected datatypes for some ...
41
votes
6answers
3k views

Does immutability hurt performance in JavaScript?

There seems to be a recent trend in JavaScript towards treating data structures as immutable. For example, if you need to change a single property of an object, better to just create a whole new ...
38
votes
19answers
4k views

Would you purchase hardware with your own money to use at work to do your job better? [closed]

At work, I was given a reasonably-spec'ed machine (dual quad 2GHz, 4GB RAM, 160GB 7200RPM drive, Win7), but it was lacking in a few places (HDD / RAM). The IT staff was OK with me replacing hardware ...
38
votes
12answers
2k views

Documentation in OOP should avoid specifying whether or not a “getter” performs any computation?

My school's CS program avoids any mention of object oriented programming, so I've been doing some reading on my own to supplement it -- specifically, Object Oriented Software Construction by Bertrand ...
36
votes
5answers
20k views

Performance of Scala compared to Java

First of all I would like to make it clear that this is not a language-X-versus-language-Y question to determine which is better. I have been using Java for a long time and I intend to keep using it. ...
33
votes
18answers
2k views

How can dev teams prevent slow performance in consumer apps?

When I previously asked what's responsible for slow software, a few answers I've received suggested it was a social and management problem: This isn't a technical problem, it's a marketing and ...
31
votes
16answers
5k views

Should you sacrifice code readability with how efficient code is? [closed]

Should you sacrifice code readability with how efficient code is? e.g. 3 lines of code into 1 line. I read in Code Craft by Pete Goodliffe that readability is key. Your thoughts?
30
votes
8answers
1k views

What causes bad performance in consumer apps? [closed]

My Comcast DVR takes at least three seconds to respond to every remote control keypress, making the simple task of watching television into a frustrating button-mashing experience. My iPhone takes at ...
29
votes
10answers
17k views

Why Should I Avoid Inline Scripting?

A knowledgeable friend recently looked at a website I helped launch, and commented something like "very cool site, shame about the inline scripting in the source code". I'm definitely in a position ...
28
votes
15answers
3k views

In the days of modern computing, in 'typical business apps' - why does performance matter? [closed]

This may seem like an odd question to some of you. I'm a hobbyist Java programmer. I have developed several games, an AI program that creates music, another program for painting, and similar stuff. ...
28
votes
10answers
4k views

Is template “metaprogramming” in Java a good idea?

There is a source file in a rather large project with several functions that are extremely performance-sensitive (called millions of times per second). In fact, the previous maintainer decided to ...
27
votes
4answers
3k views

Is there a performance benefit to using the method reference syntax instead of lambda syntax in Java 8?

Do method references skip the overhead of the lambda wrapper? Might they in the future? According to the Java Tutorial on Method References: Sometimes... a lambda expression does nothing but ...
26
votes
7answers
5k views

Writing in C for Performance? [closed]

I know I have quite frequently heard that C typically has a performance advantage over C++. I didn't really think anything else of it until I realized that MSVC doesn't even seem to support the newest ...
26
votes
9answers
3k views

Simple vs Complex (but performance efficient) solution - which one to choose and when?

I have been programming for a couple of years and have often found myself at a dilemma. There are two solutions - one is simple one i.e. simple approach, easier to understand and maintain. It ...
24
votes
12answers
15k views

Compilable modern alternatives to C/C++ [closed]

I am considering writing a new software product. Performance will be critical, so I am wary of using an interpreted or language or one that uses a emulation layer (read java). Which leads me to ...
24
votes
4answers
6k views

How to significantly improve Java performance?

The team over at LMAX have a presentation about how they were able to do 100k TPS at less than 1 ms of latency. They have backed up that presentation with a blog, technical paper (PDF) and the ...
23
votes
13answers
4k views

Why do so many developers believe performance, readability, and maintainability cannot coexist?

While responding to this question, I began to wonder why so many developers believe a good design should not account for performance because doing so would affect readability and/or maintainability. ...
23
votes
11answers
2k views

Does Refactoring towards Looser Coupling, Smaller Functions, and Separate Classes affect System Performance? (and Should I Care)

In Computer Science field, I have noticed a notable shift in thinking when it comes to programming. The advice as it stands now is write smaller, more testable code refactor existing code into ...
23
votes
6answers
20k views

Why is quicksort better than other sorting algorithms in practice?

This is a repost of a question on cs.SE by Janoma. Full credits and spoils to him or cs.SE. In a standard algorithms course we are taught that quicksort is O(n log n) on average and O(n²) in the ...
23
votes
8answers
7k views

How to Structure Bonuses for Software Developers? [duplicate]

I am a software developer, and have been asked to define a bonus structure for myself by recommending the metrics that will determine my bonus. I think, once I have defined this bonus structure, there ...
23
votes
5answers
7k views

Are DDD Aggregates really a good idea in a Web Application?

I'm diving in to Domain Driven Design and some of the concepts i'm coming across make a lot of sense on the surface, but when I think about them more I have to wonder if that's really a good idea. ...
22
votes
5answers
1k views

Multiple database accesses or one massive access?

What is a better approach when it comes to performance and optimal resource utilization: accessing a database multiple times through AJAX to only get the exact information needed when it is needed, or ...
21
votes
7answers
1k views

Does software rot refer primarily to performance, or to messy code?

Wikipedia's definition of software rot focuses on the performance of the software. This is a different usage than I am used to; I had thought of it much more in terms of the cleanliness and design of ...
21
votes
7answers
13k views

Why is NoSQL faster than SQL?

Recently I was asked: Why is NoSQL faster than SQL? I didn't agree with the premise of the question... it's just nonsense for me personally. I can't see any performance boost by using NoSQL ...
21
votes
6answers
3k views

C++ Renaissance - marketing slogan? [duplicate]

Possible Duplicate: What does the latest “C++ Renaissance” mean? Lately, I hear a lot about C++ Renaissance. What is that? C++ is currently undergoing a renaissance. This ...
20
votes
11answers
2k views

Does low latency code sometimes have to be “ugly”?

(This is mainly aimed at those who have specific knowledge of low latency systems, to avoid people just answering with unsubstantiated opinions). Do you feel there is a trade-off between writing ...
20
votes
2answers
15k views

Writing low latency Java [closed]

Are there any Java-specific techniques (things which wouldnt apply to C++) for writing low latency code, in Java? I often see Java low latency roles and they ask for experience writing low latency ...
20
votes
5answers
12k views

JIT compiler for C, C++, and the likes

Is there any just-in-time compiler out there for compiled languages, such as C and C++? (The first names that come to mind are Clang and LLVM! But I don't think they currently support it.) ...
19
votes
8answers
12k views

KPI's for Programmers [duplicate]

Do you know any Key Performance Indicators for Developers? What should be measured and monitored?
19
votes
9answers
31k views

What is the point of using lists over vectors, in C++?

I've run 3 different experiments involving C++ lists and vectors. Those with vectors proved more efficient, even when a lot of insertions in the middle were involved. Hence the question: in which ...
19
votes
4answers
1k views

How bad is it calling println() often than concatenating strings together and calling it once?

I know output to the console is a costly operation. In the interest of code readability sometimes it is nice to call a function to output text twice, rather than having a long string of text as an ...
18
votes
14answers
3k views

Is slower performance of programming languages, really, a bad thing? [closed]

Here's how I see it. There's machine code and it's all that computers needs in order to run something. Computers don't care about programming languages. It doesn't matter to them whether the machine ...
18
votes
7answers
1k views

How do I avoid “Developer's Bad Optimization Intuition”?

I saw on a article that put forth this statement: Developers love to optimize code and with good reason. It is so satisfying and fun. But knowing when to optimize is far more important. ...
18
votes
3answers
12k views

Is there any reason to use varchar over text columns in a database?

Is varchar just a remnant from before text came around, or are there use cases where you would want to use a varchar? (Or char for that matter..) (I use Postgres and MySQL (MyISAM) daily, so those ...
18
votes
5answers
3k views

Can I do anything to improve performance in VS 2010? [closed]

I'm using VS 2010 since we're developing an app in .Net 4 and the performance is driving me crazy. It's mostly bad when I don't view the IDE for a while (such as when I get pulled away for a help desk ...
18
votes
1answer
471 views

Is there any hard data to back up “Human task switches considered harmful”?

Joel Spolsky wrote a famous blog post "Human Task Switches considered harmful". While I agree with the premise and it seems like common sense, I'm wondering if there are any studies or white papers ...
17
votes
15answers
2k views

What simple techniques do you use to improve performance?

I'm talking about the way we write simple routines in order to improve performance without making your code harder to read... for instance, this is the typical for we learned: for(int i = 0; i < ...
17
votes
6answers
10k views

What makes an application scalable?

I keep seeing in job postings that the applicant must have experience writing "scalable" applications. What makes an application scalable, and how do I know that my code can scale to millions of ...
17
votes
4answers
17k views

Why after each restart, my local .NET sites take time to load for the first time? [closed]

I'm developing sites based on .NET platform. I usually deploy these sites on my local IIS, so that I can test them and see their functionality before going live. However, each time I restart windows, ...
17
votes
1answer
15k views

What is the difference between btree and rtree indexing?

I've noticed on MySQLWorkbench that you can choose how to store your indexes before forward engineering your design. The storage types are: BTREE RTREE HASH Researching this, I found some ...
16
votes
8answers
2k views

Ways to break the “Syndrome of the perfect programmer” [closed]

I am probably not the only one that feel that way. But I have what I tend to call "The syndrome of the perfect programmer" which many might say is the same as being perfectionist but in this case it's ...
16
votes
6answers
619 views

Fostering a time period where everyone can try any ideas to make software run faster?

Sometimes software performance tricks are found from a methodological and thorough search. Sometimes it requires divergent thinking and courage to try crazy ideas. Sometimes an idea is just the ...
15
votes
5answers
2k views

Resources on Writing Efficient C Code for Micro-controllers? [closed]

Serious help needed here. I love programming. I've been reading bunch of books(such as K&R) and articles/forums online for C language lately. Even tried looking into Linux code(although, i was ...