WebViewWarmUper

WKWebView inititalization and first load are very slow. WebViewWarmUper warm-ups WKWebView and UIWebView for faster first load. Download sample project to test it. You can create issue or pull requests if you have any proposals.

Installation

CocoaPods

CocoaPods is a dependency manager for Cocoa projects. For usage and installation instructions, visit their website. To integrate WebViewWarmUper into your Xcode project using CocoaPods, specify it in your Podfile:

pod 'WebViewWarmUper'

Manually

You can simply copy source files from Classes folder (WebViewWarmuper.swift) to your project.

Usage

Standard

First you should call prepare method, it should be called some time before you want to show your web view. In test app we call this method in func application(_ application: didFinishLaunchingWithOptions: ).

import WebViewWarmUper

WKWebViewWarmUper.shared.prepare()

Then, when you need new web view instance:

import WebViewWarmUper

let webView = WKWebViewWarmUper.shared.dequeue()

Advanced (custom WKWebViewConfiguration)

let customWarmUper = WKWebViewWarmUper { () -> WKWebView in
  let configuration = WKWebViewConfiguration()
  // Setup configuration.
  return WKWebView(frame: .zero, configuration: configuration)
}
// Some time after.
let webView = customWarmUper.dequeue()

Legacy

The latest version written in Objective-C is 1.x.

Performance

Comparison from Example application. We compare func loadHTMLString(_:baseURL:), but WebViewWarmUper will decrease time you spend on initialization too! Environment: iPhone XR, iOS 12.2. NOTE: Looks like system caches UIWebView instances between runs. First run after install UIWebView loads page 0.2481s, 0.3811s, 0.3841s (Resource.articleWithCss).

Resource.articleWithCss

Run		WKWebView + Warm-Up	Simple WKWebView	UIWebView + Warm-Up	Simple UIWebView
1		0.0331	0.0549	0.0382	0.0462
2		0.0316	0.0886	0.0338	0.0332
3		0.0255	0.0563	0.0307	0.0340
4		0.0388	0.0498	0.0364	0.0292
5		0.0304	0.0368	0.0369	0.0310
Ave		0.0319	0.0573	0.0352	0.0347
Dif		-45% load time	-	~ equal load time	-

Resource.articleWithWidgetAndCss

Run		WKWebView + Warm-Up	Simple WKWebView	UIWebView + Warm-Up	Simple UIWebView
1		0.0473	0.0624	0.5280	1.6593
2		0.0370	0.0804	0.0423	0.0384
3		0.0361	0.0672	0.0393	0.0376
4		0.0438	0.0610	0.0405	0.0400
5		0.0391	0.0646	0.0447	0.0379
Ave		0.0407	0.0671	0.1390	0.3626
Dif		-40% load time	-	~= (1st is random)	-

License

WebViewWarmUper is released under the MIT license. See LICENSE for details.