Examples of programming questions in performance

Speed difference in using inline strings vs concatenation in php5?
Find out where your PHP code is slowing down (Performance Issue)
Performance of try-catch in php
What is the performance difference of pki to symmetric encryption?
Horrible redraw performance of the DataGridView on one of my two screens
Hashtable in C++?
C# / F# Performance comparison
Java 2D Drawing Optimal Performance
Speeding Up Python
Why is require_once so bad to use?
C++ performance of accessing member variables versus local variables
PostgreSQL UNIX domain sockets vs TCP sockets
Is it costly to do array.length or list.count in a loop
WPF ListView Very Slow Performance - Why? (ElementHost, or Other Reason?)
Best way to check for current date in where clause of sql query
How can I find the Largest Common Substring between two strings in PHP?
Perfmon-like for Linux?
Excel Interop - Efficiency and performance
select top 1000, but know how many rows are there?
How to ignore login and logout requests in JMeter?
Highest Performance Database in Java
Is there any performance difference between ++i and i++ in C#?
python string join performance
C# How can I determine where the slow parts of my code are?
Why is float division slow?
Is there any guarantee of alignment of address return by C++'s new operation?
Why is a UDF so much slower than a subquery?
Speed up Weblogic Server startup times
Why does my C code run slow?
Best way to speed up MS SQL server
When are structs the answer?
SQL not equals & null
Any hard data on GC vs explicit memory management performance?
Windows Forms: using BackgroundImage slows down drawing of the Form's controls
Experience using gcServer="true" to set garbage collector for .NET
What is a Bookmark Lookup in Sql Server?
MySQL performance DELETE or UPDATE?
Does the number of columns returned affect the speed of a query?
SET vs. SELECT - What's the difference?
What is the fastest Dijkstra implementation you know (in C++)?
WPF Data virtualizing ListView
Speed tradeoff of Java's -Xms and -Xmx options
Benchmarking small code samples in C#, can this implementation be improved?
clearing a small integer array: memset vs. for loop
Set the Tooltip Delay Time for a Particular Component in Java Swing
What is the InnoDB equivalent of MyISAM's key_buffer_size?
File.Copy vs. Manual FileStream.Write For Copying File
Overhead of pthread mutexes?
Qt Application Performance vs. WinAPI/MFC/WTL/
C# - What are Some High Performance Best Practices/Tips for ADO.NET
Calculating vs. lookup tables for sine value performance?
How to reduce size of RTF with embedded images?
Why is Select 1 faster than Select count(*)?
How to use two numbers as a Map key
How do you measure the performance of a stored procedure?
How to decrease build times / speed up compile time in Xcode?
Precise time measurement in Java
Will I run into performance issues if I use a blob field as primary key in SQLite?
Performance of COUNT SQL function
Advantages / Disadvantages of pconnect option in CodeIgniter
ListBox, VirtualizingStackPanel, and Smooth Scrolling in WPF
Is using instanceof operator in javascript a performance issue?
Fastest way to store easily editable config data in PHP?
How do I find out why g++ takes a very long time on a particular file?
Coding Practices which enable the compiler/optimizer to make a faster program
Slow first page load on asp.net site
Best ways to reduce number of DOM elements
Why should recursion be preferred over iteration?
Python: Why is IDLE so slow?
Efficient way of finding distance between two 3D points
Which one have better performance : Derived Tables or Temporary Tables
Persistent SMTP connection in PHPMailer
Assembly: Why are we bothering with registers?
How to write Performance Test for .Net application?
The cost of passing by shared_ptr
Java performance problem with LinkedBlockingQueue
Cython Speed Boost vs. Usability
What is the time complexity of LinkedList.getLast() in Java?
What is different about C++ math.h abs() compared to my abs()
How to optimize an update SQL that runs on a Oracle table with 700M rows
Speed up a query, simple inner join with one large table and one small table
high performance hibernate insert
What's the (hidden) cost of Scala's lazy val?
What is the fastest XML parser in PHP?
Huge performance difference between Vector and HashSet
Which mySQL date query performs better?
Does enabling JMX agent have a performance overhead?
C++: Fastest method to return a C string
Why is Collections.addAll supposed to be faster than c.addAll
Regex match take a very long time to execute
Performance impact of autoboxing
Why is reflection slow?
Best practice for storing tags in a database?
JavaScript loop performance - Why is to decrement the iterator toward 0 faster than incrementing
Will enabling XDebug on a production server make PHP slower?
Why is this List<>.IndexOf code so much faster than the List[i] and manual compare?
What's better to use, a __try/__except block or a try / catch block?
PHP behavior of include/require inside conditional
What is Azul "Zing"?
How can I freeze the execution of a program?
Ways of creating a constant IEnumerable<TSomeType>...?
Python - Speed up an A Star Pathfinding Algorithm
Running Tomcat in production environments
MySQL - best data type for simple time with hours and minutes
Performance cost of 'new' in C#?
Performance: XDocument versus XmlDocument
Hibernate Criteria vs HQL: which is faster?
System.Net.WebClient unreasonably slow
How to speed up the left and right arrow keys for editing text?
Alternatives to FastDateFormat for efficient date parsing?
What is faster in C: structs or arrays?
why getSpeed() always return 0 on android
Is ++i really faster than i++ in for-loops in java?
Mysql Slow Insert
What is faster in PHP, single or double quotes?
When to consider Solr
Fast reading of little endian integers from file
Hibernate performance
Need to speed up automapper...It takes 32 seconds to do 113 objects
PHP Best way to cache MySQL results?
C/C++: is GOTO faster than WHILE and FOR?
Compilation and execution time of C++ vs C source code
Performance of Arrays and Hashes in Ruby
Hints to improve Eclipse performance
Exploding an array within a foreach loop parameter
Why is using a std::multiset as a priority queue faster than using a std::priority_queue?
Fastest way to fill an array with a single value
numpy float: 10x slower than builtin in arithmetic operations?
Performance of StringTokenizer class vs. String.split method in Java
Is it better to execute many sql commands with one connection, or reconnect every time?
Why is a LinkedList Generally Slower than a List?
How can I make this C# loop faster?
Apache POI Java Excel Performance for Large Spreadsheets
Why Compiled RegEx performance is slower than Intrepreted RegEx?
Entity framework uses a lot of memory
CTE vs View Performance in SQL Server
Get all files and directories in specific path fast
Does System.Activator.CreateInstance(T) have performance issues big enough to discourage us from using it casually?
If registers are so blazingly fast, why don't we have more of them?
Why does Java's ArrayList's remove function seem to cost so little?
Binary Search on Keys of SortedList<K, V>
C# Reflection: Fastest Way to Update a Property Value?
Searching for a string in a large text file - profiling various methods in python
Any way to speed up Python and Pygame?
DELETE performance in SQL Server on clustered index, large table
When should you use a script loader?
Is there a maximum size that web pages should be kept under?
Doing calculations in MySQL vs PHP
The Most Efficient Implementation of UniqueQueue and UniqueReplacementQueue Collections in .NET
Is "SELECT COUNT(column)" faster/slower than "SELECT COUNT(*)"?
Benefits of using reserve() in a vector - C++
SELECT vs UPDATE performance with index
Speed difference between If-Else and Ternary operator in C...?
In Django, what is the most efficient way to check for an empty query set?
Is it inefficient to pass large objects as parameters in Java?
What is the best standard data structure to build a Graph?
How do I get Windows to go as fast as Linux for compiling C++?
Is there any performance benefit in using const or readonly modifiers on fields in c#?
Python string search efficiency
Is optimizing JavaScript for loops really necessary?
TreeMap or HashMap faster
Why are loops slow in R?
What are the rules for the "Ω(n log n) barrier" for sorting algorithms?
Optimizing Python Code
When to use each method of launching a subprocess in Ruby
Comparing Querydsl, jOOQ, JEQUEL, activejdbc, iciql and other query DSLs
How do I stop JPA Facet on Eclipse from updating all the time?
SQL Server pivot vs. multiple join
Does the order of LINQ functions matter?
What can cause a program to run much faster the second time?
Efficiently compute Intersection of two Sets in Java?
Apache Benchmark - concurrency and number of requests
Proper way to generate html dynamically with jQuery
Java ByteBuffer performance issue
StringBuilder append vs +
Why does the Contains() operator degrade Entity Framework's performance so dramatically?
Debugging Entity Framework SQL statements
Is clock_gettime() adequate for submicrosecond timing?
string.IndexOf performance
what is faster hashset clear or new hashset?
MySQL multiple insert performance
Performance of Java Enums?
do-while is the fastest loop in php?
PHP: Remote MySQL connections very slow
Doxygen is Slow
speed comparison between fgetc/fputc and fread/fwrite in C
Define TRACE Constant in .NET / Visual Studio
Why do std::string operations perform poorly?
Find the index of the n'th item in a list
How does table alias names affect performance?
Object pools in high performance javascript?
MongoDB find and remove - the fastest way
How to reduce the "Time for the first byte" on my website?
most simple way to start a new process/thread in PHP
A faster alternative to DecimalFormat.format()?
Why C++ lambda is slower than ordinary function when called multiple times?
My Python program is very slow! How can I speed it up? Am I doing something wrong?
Why is iterating through an array backwards faster than forwards
Most efficient way to iterate over all DOM elements
JavaScript Performance: Multiple variables or one object?
Performance 32 bit vs. 64 bit arithmetic
Which loop has better performance? Increment or decrement?
Fastest way to create files in C#
Fastest and most efficient way to create XML
How much memory before it becomes rude?
Get random element and remove it
Accurate Pagination with left Joins
C faster way to check if a directory exists
Timing Execution Speed of Python Code
rgb to yuv420 algorithm efficiency
PHP MySQL INSERT 1-3,000 rows as quickly and efficently as possible
What is the fastest/safest method to iterate over a HashSet?
Python: performance comparison of using `pickle` or `marshal` and using `re`
MongoDB ranged pagination
Which is the fastest method of input in C++
Profiling a long-running Python Server
CASE vs Multiple UPDATE queries for large data sets - Performance
Which ordering of nested loops for iterating over a 2D array is more efficient
Speed up bulk insert operations with NHibernate
In what order are Panels the most efficient in terms of render time and performance?
Different decision tree algorithms with comparison of complexity or performance
array.forEach running faster than native iteration? How?
Which is more efficient : using removeAll() or using the following HashMap technique to retain only changed records in an ArrayList
Redis 10x more memory usage than data
Why is Solr so much faster than Postgres?
Sql Server - Alternative of doing a RTRIM/LTRIM in the where clause
MySQL group-by very slow
TLB misses vs cache misses?
Tweaking performance of Java's sockets
In JNI, how do I cache the class, methodID, and fieldIDs per IBM's performance recommendations?
Java, assert file equals
How to profile django application with respect to execution time?
Disappointing performance with Parallel.For
Why is my .jar file running slower than the program in eclipse?
How to reduce server "Wait" time?
Should I use prefixfilter or rowkey range scan in HBase
Profiling a C++ project in terms of execution time
Function calls are expensive" vs. "Keep functions small
Any detailed and specific reasons for Why MongoDB is much faster than SQL DBs?
Parallel construction of a distance matrix
How To Slow Down A SQL Query?
Why is Strassen matrix multiplication so much slower than standard matrix multiplication?
in OR condition which side evaluate first in python?
Change sign using bitwise operators
Speeding up GROUP BY, SUM and AVG queries
What's the most efficient way of checking whether a string begins with a certain character in TCL?
How to prevent HTML5 audio from predownload / streaming on load?
Does really SplFixedArray perform better than arrays?
Redis is slow to get large strings
What is the meaning of O(M+N)?