optimal approach to animate radar in iOS?

I'm trying to animate the heading line of a naval-style radar (the spinning part below) in iOS, like this: My cur...

Why does QtGraphicalEffects cause changes to the Render Buffer each frame??

I am having some pretty big performance issues using a ListView where all delegates are using a RectangularGlow as t...

System.out.println() vs \n in Java?

Let's say I wanted to print 5 lines. Which is the best method (for performance and readability). System.out.println...

Performance testing : meaningful graph of a 3 variable statistic result?

I'm performing performance testing of a computer application (JAVA). The test concerns the response time (t) obtaine...

SQL Server SELECT LAST N Rows?

This is a known question but the best solution I've found is something like: SELECT TOP N * FROM MyTable ORDER BY I...

What do we mean by “top percentile” or TP based latency??

When we discuss performance of a distributed system we use the terms tp50, tp90, tp99.99 TPS. Could someone explain ...

Efficiently count zero elements in numpy array??

I need to count the number of zero elements in numpy arrays. I'm aware of the numpy.count_nonzero function, but ther...

Ruby Array find_first object??

Am I missing something in the Array documentation? I have an array which contains up to one object satisfying a cer...

Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”??

The following are two methods of building a link that has the sole purpose of running JavaScript code. Which is bett...

Efficiently count zero elements in numpy array??

I need to count the number of zero elements in numpy arrays. I'm aware of the numpy.count_nonzero function, but ther...

Most efficient way to find smallest of 3 numbers Java??

I have an algorithm written in Java that I would like to make more efficient. A part that I think could be made more...

For android development can I use JPG image instead of PNG image on image views??

The main purpose of this question is to know what is the best option to choose between PNG and JPG for android devel...

Fastest way to determine if record exists?

As the title suggests... I'm trying to figure out the fastest way with the least overhead to determine if a record e...

Spark: Fastest way to look up an element in an RDD?

I have a custom class E which has, among others, a field word. I have a large es: RDD[E] with several 100000 element...

Why is vectorization, faster in general, than loops??

Why, at the lowest level of the hardware performing operations and the general underlying operations involved (i.e.:...