Stopwatch stopwatch1 = new Stopwatch(); Stopwatch stopwatch2 = new Stopwatch(); string l = "my test"; string u = "MY TEST"; for (int i = 0; i < 25; i++) { l += l; u += u; } stopwatch1.Start(...

I´m trying to improve the load time and performance of my website. To summarize this is the average loading time stats that I get without including Google Tag Manager. However when I just includ...

The following two functions logically do the same thing, but func2, which stores the result in a temporary variable, is slower. def func1(a): return a.astype(np.float64) / 255.0 def func2(a): t...

Unfortunately, the standard C++ library doesn't have a single call for sincos, which gives a place for this question. First question: If I want to calculate a sin and a cos, is it cheaper to calc...

I came up with the following implementation for the Greedy Set Cover after much discussion regarding my original question here. From the help I received, I encoded the problem into a "Greedy Set Co...

Suppose I have a matrix that is 100000 x 100 import numpy as np mat = np.random.randint(2, size=(100000,100)) I wish to go through this matrix, and if each row contains entirely either 1 or 0 I...

I'd like to see my calls to performance.mark(...) show up on Chrome's dev tools Performance tab. All the documentation I can find online seem to refer to the no longer existing "Timeline" tab, whil...

I would like to fully understand the meaning of the information about min/med/max. for example: scan time total(min, med, max) 34m(3.1s, 10.8s, 15.1s) means of all cores, the min scan time is ...

I have a vector of scalar values of which I'm trying to get: "How many different values there are". For instance in group <- c(1,2,3,1,2,3,4,6) unique values are 1,2,3,4,6 so I want to get 5. ...

In this Yahoo article from 2007, the authors argue that static assets should be split across different hostnames because browsers follow a suggestion from the HTTP/1.1 spec to limit parallel downlo...

Based on getting Query Execution Statistics using this extremely useful piece of SQL obtained from this post Most Executed Stored Procedure - Stack Overflow: SELECT TOP 100 qt.TEXT AS 'SP Name', ...

Just out of curiousity (not really expecting a measurable result) which of the following codes are better in case of performance? private void ReplaceChar(ref string replaceMe) { if (replaceMe.Co...

I have a dictionary such as: d = {'a':'a-val', 'b':'b-val', 'c':'c-long-val'*1000} And I need to repeatedly access d['c'] as in: print('value of c is', d['c']) x_queue.put(d['c']) some_function...

Just came across the register keyword in C++ and I wondered as this seems a good idea (keeping certain variables in a register) surely the compiler does this by default? So I wondered is this keyw...

Imagine that I have a List of Cards on my react application. So I will have two components, the <ListCard /> and <Card />. My doubt is that where I work, when we have something like thi...

I have been stuck with computing efficiently the number of classmates for each student from a course-level database. Consider this data.frame, where each row represents a course that a student has ...

I am using a surface texture view to display videos. The videos are shown in a carousel which is essentially a view pager. I have already tried releasing the surface view on the surface gets destro...

Consider something like... for (int i = 0; i < test.size(); ++i) { test[i].foo(); test[i].bar(); } Now consider.. for (int i = 0; i < test.size(); ++i) { test[i].foo(); } for (int i = ...

I had an issue with Postman desktop app and the issue was it became so slow that made it almost useless, I had to restart it after making each request.

Basic Facts Lists are mutable (supporting inserts, appending etc.), Tuples are not Tuples are more memory efficient, and faster to iterate over So it would seem their use-cases are clear. F...

I'm having a website, which loads considerably slower, when I'm adding <meta http-equiv="Content-Security-Policy" content="default-src 'self'"> to the head of the index.html. After debug...

Background We recently had an issue with query plans sql server was using on one of our larger tables (around 175,000,000 rows). The column and index structure of the table has not changed for 5+ ...

What is the fastest c# function that takes and int and returns a string containing a letter or letters for use in an Excel function? For example, 1 returns "A", 26 returns "Z", 27 returns "AA", etc...

I have a table 'MSATTRIBUTE' with 3000K rows. I used the following query to retrieve data, this query has different execution plan with same DB data but in different env. in one env, it appears ful...

I'm wondering if there is a performance issue using attribute selectors instead of class selectors. div.test {} div[test] {} P.S. : I'm only interested in CSS performance, not JS.