webroot performance issues

way is to use the Picture Wizard (CSS Sprite). The picture Wizard is to put many pictures in a large picture, through the CSS to display part of the picture.As for the Picture Wizard operation details are not much to do introduction, online related content a lot.9, attention to control cookie size and pollutionBasic principles and methods of use:Basic and advanced knowledge of cookies can be seen in an article I wrote, "JavaScript Operation Cookie."Because the cookie is a local disk file, every

occurs every time the application invokes the RCW. By studying code and testing, such as using Removememorypressure (4004) to counteract the same bytes addmemorypressure (4004) in the RCW before each call to create serviced component Can solve this problem temporarily.The final solution is that we create our own pool of objects in the application itself (creating a set of global objects that simply manage their existence cycles) to drastically reduce createinsance and CREATERCW calls. After thi

browser-level code basis, so it's much faster than executing JS. Inevitably, creating and destroying HTML parsers can also result in a performance penalty, so it's best to control the number of times you create innerhtml to a reasonable extent. For example, the following code creates many list items using innerHTML:for (Var i=0,len=value.length;i　　This is a very inefficient practice to set the innerHTML once per cycle. Also, each loop will read the i

, and the V1 on the sort is almost 3 times times the V2. Further testing, if added limit ... offset (often used with order by for paging), the gap between the two view is more pronounced: If you remove the sort operation, the V1 query will take more time than V2, but it is almost an order of magnitude less than before. Confined to space, this place does not map. The number of records in this test is less than million, you can see the gap between the two views, interested peers can self-verify

Servicestack.redis there is a method called Addrangetolist, this method is a performance problem. The implementation code for this method is as follows:public void Addrangetolist (string listId, listThis actually converts the n data into n commands. Redis's over there. For a single command parsing execution, performance can degrade a lot.The correct approach is to use bulk rpush. See also: http://redis.read

performance requirements of Eclipse RCP for client applications (the old machine uses eclipse development to know that the export Eclipse rcp long wait for the taste, 2 hours, really live as death! ）？ and to maximize the processing capacity of the machine? In this regard I have tried a number of ways that can be used to improve these two issues: 1, choose the most appropriate data delivery methods, RMI,

Label:Original: Initial SQL Server performance issues (1/4): Server overviewWhen you are a DBA, many people will complain to you: "This program data loading and snail, you see the server is not a problem?" "There are many reasons for this problem. May be the application server problems, network problems, program implementation of the problem, the database server overload. Regardless of the problem, the data

in Transactions can guarantee the speed. Otherwise, some databases start a transaction every insert operation by default, resulting in low performance. We can commit a transaction only once every insert tens of thousands of records, which is faster. 7. For performance-oriented applications, EF entity classes are not recommended. Of course, EF is not recommended as a result: When using SQLite to append

to create consumer repeatedly and communicate with the server frequently, but it is not a problem in applications with low performance requirements.2, do not use Jmstemplate, manually create a consumer, at this time can make full use of prefetch mechanism. In conjunction with multithreading, each thread has its own consumer, which maximizes the speed advantage of MQ at high throughput.PS: How to see the prefetch mechanism of ACTIVEMQ?The default valu

than using cursors. If development time permits, a cursor-based approach and a set-based approach can all be tried to see which method works better. 28. Set NOCOUNT on at the beginning of all stored procedures and triggers, set NOCOUNT OFF at the end. You do not need to send a DONE_IN_PROC message to the client after each statement that executes the stored procedure and trigger. 29. Try to avoid large transaction operation and improve the system concurrency ability. When using constraints and t

'=>0) Use isset($array[$account])) to detect if an account exists in the array Summarize Because the in_array() function iterates through the array of queries, O (n) increases time-consuming with n (the length of the arrays). Therefore, the use of functions on large arrays in_array() should consider efficiency issues. When faced with large array queries, you should try to use key queries instead of value queries in PHP. '). addclass (' pre-n

pool size.When the connection pool is too small, the new customer cannot connect to the system after the connection pool is full, and an error message appears in the log. The general workaround is to increase the connection pool. But on the other hand, the connection pool can lead to new performance problems due to inefficient resource loss. So how much is the connection pool tuned to be more appropriate?Workaround :Rule of thumb 1: Set the initial p

=st.session_idINNER JOINSys.dm_exec_connections cn ones.session_id=cn.session_id the INNER JOINSys.sysprocesses SP onSp.spid=es.session_id - Left OUTER JOINSys.dm_exec_requests ER onst.session_id=er.session_id - ander.session_id is NULL - CrossAPPLY sys.dm_exec_sql_text (cn.most_recent_sql_handle) est + WHERE(DATEDIFF(Ss,cn.last_read,GETDATE())+DATEDIFF(Ss,cn.last_write,GETDATE()))> - - andLastwaittype not inch('broker_receive_waitfor','WAITFOR')

Tags: var self-increment div comm between stat lap BMS ATIWhat is predicate out of bounds? predicate out-of-bounds is the fact that the query condition of the SQL statement exceeds the scope recorded by the database statistics. predicate out-of-bounds causes the Oracle optimizer to incorrectly select the execution plan of the SQL statement, resulting in performance issues. Here is a simple example of a pred

- #pragmaMark-Controls whether the status bar is displayed - /**86 * Returns yes for hidden status bar, no opposite*/ the-(BOOL) Prefersstatusbarhidden the { - returnYES; the } the @endThe idea of cache optimization:(1) First go to the cache pool to find if there is a cell that satisfies the condition, if there is, take it directly.(2) If not, create a cell yourself(3) Create a cell, and set a unique tag (the one that belongs to "" to cover a chapter)(4) Set data to cellNote the point:Defi

AngularJs ng-repeat performance issues that must be notedNg-repeat of AngularJs allows us to easily traverse arrays to generate Dom elements, but improper use may also cause performance problems. In the project, after loading a list using ng-repeat, If you request data again and then filter the list, the Code may write as follows:

allows you to set reuseidentifier by passing in a specific string identifier when initializing UITableViewCell ( Generally used UITableViewCell class name). When UITableView requires DataSource to return UITableViewCell, a string is first identified to the object pool to find the corresponding type of UITableViewCell object, if there is, reuse, if not, pass the string identifier to initialize ? a UITableViewCell object.Image examples:Note: A window can be placed under (visible) three cells, the

(itemdetails entity)2 {3 varSW =NewStopwatch ();4 SW. Start ();5 using(vardb =Newshoppingdbconn ())6 {7 varsql =NewStringBuilder ();8 for(inti =0; I 10000; i++)9 {Ten //Generate SQL One SQL. Append (Itemdetailbatch.batchadd (entity)); A } - //Execute SQL once - db. Database.executesqlcommand (SQL. ToString ()); the } - SW. Stop (); -

servers, the parameters of the last few lines can be a good way to reduce the number of time_wait sockets, but for Squid, the effect is not small. This parameter controls the maximum number of time_wait sockets, preventing squid servers from being dragged to death by a large number of time_wait sockets.Tuning is complete, then press to see the effect of it.# Netstat-n | awk '/^tcp/{++y[$NF]} END {for (w in y) Print W, Y[w]} ' established 968Issue 1: How to resolve the request after the e

Viewholder and avoid Time-consuming operation in GetView;2) control the frequency of task execution according to the sliding state of the list;3) try to turn on hardware acceleration to be a more fluid slide of the ListView;Bitmap optimization has been mentioned before, the main picture of the sampling,bitmapfactory.options insamplesize parameters. Thread Optimization: The most important idea is to use a thread pool to avoid the large number of programs that exist Thread. The thread pool can