HarmonyOS 鸿蒙Next：提升复杂H5套壳App启动速度，避免白屏方案

App嵌套H5，主页面的展示逻辑如下图所示，

build() {  
    Stack() {  
        // 加载中的loading  
        if (this.isLoading) {  
            LoadingProgress()  
                .color(Color.Grey)  
                .width(50)  
                .height(50)  
                .zIndex(2);  
        }  
  
        Web({  
            src: Constants.MAIN_PAGE_URL,  
            controller: this.webController  
        })  
            .width("100%")  
            .height("100%")  
            .domStorageAccess(true)  
            .onlineImageAccess(true)  
            .imageAccess(true)  
            .zoomAccess(false)  
            .javaScriptAccess(true)  
            .darkMode(this.mode)  
            .cacheMode(this.cacheMode)  
            .javaScriptProxy({  
                object: this.jsBridge,  
                name: "native",  
                methodList: ["exec"],  
                controller: this.webController,  
            })  
            .onOverrideUrlLoading((webResourceRequest: WebResourceRequest) => {  
                console.info("onOverrideUrlLoading url : ", webResourceRequest.getRequestUrl());  
                // console.info("TIME_STAMP08 : ", systemDateTime.getTime(false) + "");  
                return false;  
            })  
            .onAppear(() => {  
                this.isLoading = true;  
                console.info("TIME_STAMP04 : ", systemDateTime.getTime(false) + "");  
            })  
            .onPageBegin(() => {  
                console.info("TIME_STAMP05 : ", systemDateTime.getTime(false) + "");  
                // 网页开始加载时触发该回调  
            })  
            .onProgressChange((event) => {  
                if (event) {  
                    this.curProgress = event.newProgress;  
                    if (this.curProgress === 100) {  
                        // this.isLoading = false;  
                        console.log("TIME_STAMP ", systemDateTime.getTime(false) + "", "current progress:" + this.curProgress);  
                    }  
                }  
            })  
            .onPageEnd(() => {  
                console.info("TIME_STAMP06 : ", systemDateTime.getTime(false) + "");  
            })  
            .onPageVisible((event) => {  
                this.isLoading = false;  
                console.info("TIME_STAMP07 : ", systemDateTime.getTime(false) + " ", event.url);  
            });  
    }  
}

为了提升用户体验，在主页面添加了loading，但是从loading结束到H5页面完全显示，有短暂白屏，有没有比较好的优化方案？

关于应用冷启动过程速度较慢的问题，除了提前初始化arkweb组件、url预连接，还有没有比较好的方案？