analysis API The time-consuming is to API The total time taken is divided into different parts , Clearly know what causes the excessive time consumption . We use different tools , Time consuming analysis in different network environments , So as to put forward corresponding optimization suggestions .

1. The request is sent too slowly, resulting in increased time consumption ;
2. DNS Too slow parsing leads to increased time consumption ;
3. Poor network environment leads to increased time consumption ;
4. Waiting in line all the time leads to slow response ;
5. The server response is too slow, resulting in increased time consumption ;
6. The response volume is too large, resulting in increased time consumption ;
7. wait ……

Generally feel from the senses API Slow interface response , Most people will directly attribute it to the slow processing of the server , In fact, it is unreasonable . By means of Intranet In the environment API Time consuming analysis and Internet environment API Comparison of time-consuming analysis , It is generally recognized that the reason is .

Through the browser developer tool analysis

Focus on indicators Waiting (TTFB),TTFB Represents the arrival time of the first byte . This time includes a round trip delay and the time it takes the server to prepare a response . It can be approximately considered that the server is time-consuming .

If the network condition is bad or the response data is too large , be Content Download It takes longer , Compression response should be considered at this time .

Timing

In developer tools Network The cyber source that is invoked in the current page is displayed. , Click resources to view the details of resources , among Timing This is the time-consuming situation of resource invocation .

• Queueing. 【 Queuing 】 The browser queues requests when ： Requests with higher priority . Six have been opened for this source TCP Connect , This is the limit . Only applicable to HTTP/1.0 and HTTP/1.1. The browser is temporarily allocating space in the disk cache .
• Stalled. 【 stop it 】 The request may be stopped for any of the reasons described in queuing .
• Proxy negotiation. 【 Agency negotiation 】 The browser is negotiating the request with the proxy server .
• Request sent. 【 Send a request 】 The request is being sent .
• Waiting (TTFB). 【 Waiting for the 】 The browser is waiting for the first byte of the response .TTFB Represents the arrival time of the first byte . This time includes a round trip delay and the time it takes the server to prepare a response .
• Content Download. 【 Response content download 】 The browser is receiving a response .

Other possible

• DNS Lookup. 【DNS】 The browser is parsing the requested IP Address .
• Initial connection. 【 Initialize connection 】 The browser is establishing a connection , Include TCP handshake / Try again and negotiate SSL.