Yes, views can have a clustered index assigned and, when they do, they’ll store temporary results that can speed up resulting queries. Microsoft’s own documentation makes it very clear that Views can improve performance. First, most views that people create are simple views and do not use this feature, and are therefore no different to … Read more
Chrome Developer Tools has an Audits tab which can show unused CSS selectors. Run an audit, then, under Web Page Performance see Remove unused CSS rules
I’m ignoring the issue that your benchmarking might be flawed, and taking the result at face value. Is it the compiler or is it at the hardware level? That latter, I think: if (a != 0 && b != 0) will compile to 2 memory loads and two conditional branches if (a * b != … Read more
Fast ways Given your specifications (plus additional info in the comments), You have a numeric ID column (integer numbers) with only few (or moderately few) gaps. Obviously no or few write operations. Your ID column has to be indexed! A primary key serves nicely. The query below does not need a sequential scan of the … Read more
The languages have similar feature-sets. The performance difference comes from the fact that Fortran says aliasing is not allowed, unless an EQUIVALENCE statement is used. Any code that has aliasing is not valid Fortran, but it is up to the programmer and not the compiler to detect these errors. Thus Fortran compilers ignore possible aliasing … Read more
Well, they are semantically different, the Number constructor called as a function performs type conversion and parseInt performs parsing, e.g.: // parsing: parseInt(“20px”); // 20 parseInt(“10100”, 2); // 20 parseInt(“2e1”); // 2 // type conversion Number(“20px”); // NaN Number(“2e1”); // 20, exponential notation Also parseInt will ignore trailing characters that don’t correspond with any digit … Read more
Dynamic linking can reduce total resource consumption (if more than one process shares the same library (including the version in “the same”, of course)). I believe this is the argument that drives its presence in most environments. Here “resources” include disk space, RAM, and cache space. Of course, if your dynamic linker is insufficiently flexible … Read more
Don’t forget that map keeps its elements ordered. If you can’t give that up, obviously you can’t use unordered_map. Something else to keep in mind is that unordered_map generally uses more memory. map just has a few house-keeping pointers, and memory for each object. Contrarily, unordered_map has a big array (these can get quite big … Read more
No, it’s not. Use the Stopwatch (in System.Diagnostics) Stopwatch sw = Stopwatch.StartNew(); PerformWork(); sw.Stop(); Console.WriteLine(“Time taken: {0}ms”, sw.Elapsed.TotalMilliseconds); Stopwatch automatically checks for the existence of high-precision timers. It is worth mentioning that DateTime.Now often is quite a bit slower than DateTime.UtcNow due to the work that has to be done with timezones, DST and such. … Read more