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Tag: optimization
Why does this dynamic programming optimization actually make code slower?
This is from Leetcode problem: Concatenated Words. Below is a working solution. I added what I thought to be an optimization (see code comment), but it actually slows down the code. If I remove the wrapping if statement, it runs faster. To me, the optimization helps avoid having to: call an expensive O(n) sub…
Does putting intermediary math results into variables improve performance in javascript?
I have been playing around with the Riemann zeta function. I want to optimize execution time as much as possible here so I put the intermediary results in temporary variables. But testing revealed that I get no performance boost from this. At least not noticeably. My question is: Even though I couldn’t …
Custom hook when taking data in next render lost data
I made a hook useSendFormData , when i use it i get Invalid hook call. Hook takes data from SubmitForm url:string, method: post or put success: success message if it was success id: not required but if item has id i is added to api call. auth default false Problem is it loses data on renders I don’t kno…
Performances of ‘lineTo’ method when going beyond canvas dimensions
Using a canvas context, assuming I call beginPath then twice lineTo with x=-999, y=-999 and x=50, y=50 then finally stroke, it will draw a line from the top-left corner to the (50,50) point. During the process did the top-left outside part of the line was draw from the outside or did it was draw from the visi…
Optimise javascript canvas for mass-drawing of tiny objects
I’ve been working on a game which requires thousands of very small images (20^20 px) to be rendered and rotated each frame. A sample snippet is provided. I’ve used every trick I know to speed it up to increase frame rates but I suspect there are other things I can do to optimise this. Current opti…
Why Has My Google PageSpeed Insights Score Lowered So Much?
Prod For desktop, I have a site with a decent page speed score (currently, 96): https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fwww.usstoragecenters.com%2Fstorage-units%2Fca%2Falhambra%2F2500-w-hellman-ave&tab=desktop Stage I’m trying to improve the score (mostly for mobile…
find sum of multiples 3 and 5, JS
I’m given a number and I need to find the sum of the multiples of 3 and 5 below the number. For example: 20 => 78 = 3 + 5 + 6 + 9 + 10 + 12 + 15 + 18 My code works, but not for numbers greater than 1,000,000 (I tested it for 100,000 – it gives
Optimizing native hit testing of DOM elements (Chrome)
I have a heavily optimized JavaScript app, a highly interactive graph editor. I now started profiling it (using Chrome dev-tools) with massive amounts of data (thousands of shapes in the graph), and I’m encountering a previously unusual performance bottleneck, Hit Test. This takes up 65% of everything (…
gulp – exclude a file when minifying CSS
Im new to Gulp.. I have been able to successfully install and concatenate and minify my .js and .css files, however, there is one .css file which i want to exclude – print.css Ive followed the instructions here: https://www.npmjs.org/package/gulp-ignore install gulp-ignore in my local directory, and mod…