Chrome Timeline指標說明

　　Blocked time includes any pre-processing time (such as cache lookup) and the time spent waiting for a network connection to become available. Internet Explorer will only create a maximum of two concurrent network connections per host name (i.e. www.microsoft.com) and will queue up requests until a network connection is available. Often the Blocked time is the most significant factor in the download time of images embedded in a web page. 

閉塞時間，包括全部的過程以前的時間（像，cache對比）和等待網絡連接的時間，IE在每一個主機名（像 http://www.microsoft.com/）下最多隻建立兩個當前的網絡鏈接，並且要排隊等待直到這個網絡連接可用，一般，閉塞時間影響網頁中圖片加載時間的重要因素。
　　Connect is the time required to create a TCP connection to the web server (or proxy). If a secure HTTPS connection is being used this time includes the SSL handshake process. Keep-Alive connections are often used to avoid the overhead of repeatedly connecting to the web server. 
鏈接時間，是建立TCP鏈接到服務器或者代理服務器所花費的時間，若是一個包含SSL的安全的HTTPS鏈接存在，Keep-Alive連接常常被用到，以免屢次重複的鏈接WEB服務器。
　　Send is the time required to send the HTTP request message to the server and will depend on the amount of data that is sent to the server. For example, long Send times will result from uploading files using an HTTP POST 
發送，是發送HTTP請求到服務器的時間，並且這個時間取決與發送請求的數據量的大小，例如，長的發送時間是因爲用 PSOT方式上傳文件形成的。
　　Wait is the idle time spent waiting for a response message from the server. This value includes delays introduced due to network latency and the time required to process the request on the web server. 
等待，是花費在等待服務器響應消息的空閒時間，這個值包括網絡延遲和服務器處理請求的時間。
　　Receive is the time taken to read the response message from the server. This value will be depend on the size of the content returned, network bandwidth and whether HTTP compression was used. 
接收，是花費在從服務器讀取響應消息的時間。這個值能夠受到請求消息內容的大小，網絡帶寬和是否使用了HTTP壓縮。
　　Cache Read is the time taken to read the content from the browser cache during (Cache) or 304 responses. 
緩存讀取，是花費在從瀏覽器緩存中讀取內容或者304響應的時間。
　　TTFB (or Time To First Byte) is the duration from the initial network request being initiated by the browser to the first byte being received from the server. It includes TCP connection time, the time to send the request and the time taken to get the first byte of the response message. 
TTFB，是最初的網絡請求被髮起到從服務器接收到第一個字節這段時間，它包含了TCP鏈接時間，發送HTTP請求時間和得到響應消息第一個字節的時間。

　　Network is the total duration of all network related operations for an HTTP request. 
Network，是全部的對一個HTTP請求的相關操做的這段時間。

Chrome中按F12能夠打開開發者工具，點擊NetWork面板便可看到對應的資源加載的時間，如圖:

其實Chrome開發者工具裏面還有不少對前端頁面性能分析頗有用的東西就不給你們一一介紹啦，你們有空本身多去研究研究，要主動學習!