Difference between revisions of "Region Performance Improvement Guide"

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== Draft Under Development ==
#REDIRECT [[Improving_Region_Performance]]
 
This article explains how to check your Second Life Region's performance and the steps you can take to improve it.
 
== Checking Your Region's Performance ==
 
To see the performance of your Region you'll want to check the Region's Frames Per Second (FPS).  To do this you can use the
[https://support.secondlife.com/ics/support/KBAnswer.asp?questionID=4426 Statistics Bar].  While standing on your land select the View Menu > View Statistics Bar.  This can be a bit overwhelming so we'll guide you through it.  Note, Sim stands for Simulator and is another name for Region.  In the Picture below we've circled the "Sim FPS", which is your Regions Frames Per Second.
 
[[Image:StatisticsBar_Initial.PNG|thumbnail|none]]
 
To interpret the Sim FPS performance of your Region:
 
* 45 FPS.  The best (maximum).  No action necessary.
* 35 - 44 FPS.  This is good quite good and you  don't need to tune if it never goes below 35 FPS.
* 20 - 35 FPS.  This is slow and should be noticeable.  Tuning is needed to improve your Region's performance.
* 10 - 20 FPS: This is bad and quite serious.  Serious action is needed quickly.
* 0 - 10 FPS: This is terrible.  Time to open a Support Ticket.
 
If your performance is consistently over 35 FPS at its the busiest time for your Region you can stop here.  In the screenshot above, you'll notice the Sim FPS is 21, which means the Region is very slow.  The Main Agents line shows 96, which is the number of Agents in your Region.  As we'll discuss this is exceptionally high and is the prime cause of this Region's slow FPS.  The Child Agent is the number of Avatars outside your Region that can see into your Region and also can slow your Region down if it is a significant number.
 
To see more detail on what is slowing down your Region, expand the
[https://support.secondlife.com/ics/support/KBAnswer.asp?questionID=4426 Statistics Bar] by clicking on the last line "Time (ms)" with your mouse to see the additional Region statistics shown below:
 
[[Image:Statistics_Bar_TimeMS.PNG|thumbnail|none]]
 
The "Total Frame Time" shows the number of milliseconds (ms) to display a single frame.  The best time is less than 22 ms.  For a detailed explanation of these see the knowledge-based article on the [https://support.secondlife.com/ics/support/KBAnswer.asp?questionID=4426 Statistics Bar] and scroll to the section on Time.
 
== Improving Your Region's Performance ==
 
There are a number of steps that you can take to improve your Region's performance.  Each Region is unique but we've attempted to list the steps to improve in an approximate order by most impactful and easiest to improve and are:
 
=== Reduce the Maximum Number of Avatars in Your Region ===
 
The number of avatars in a region is the most common cause and usually the biggest contributor to low Region FPS.  Lowering the maximum number of Avatars allowed into your Region will usually increase the Region's FPS.  This can be done by selecting the World Menu > Region / Estate Menu Item. This will bring up the Region / Estate  window where you can adjust the Agent Limit field.  Note, the default is 40 and many Regions that suffer from poor performance have increased this number above 40.  An avatar can see a maximum of approximately 30 other avatars. You can read the knowledged-based article on how to set the [https://support.secondlife.com/ics/support/KBAnswer.asp?questionID=4417 number of avatars in a region]. 
 
[[Image:RegionWindow_Region_Tab.PNG|thumbnail|none]]
 
=== Remove Top Scripts ===
 
The most active scripts in your Region can slow it down.  In the Statistics Bar the Script Time line shows how many milliseconds your scripts are taking. If it is over 3 milliseconds then it may be worth investigating if this can be reduced.  Too see which scripts are the most active, in your Region / Estate Window, select the Debug Tab as shown below.
 
[[Image:Region_Window_Debug_Tab.PNG|thumbnail|none]]
 
Then click on Get Top Scripts, which will bring up a Window shown below.
 
[[Image:Region_Window_Top_Colliders.PNG|thumbnail|none]]
 
Also, note that reducing the total number of scripts in your Region can improve performance.
 
=== Remove Top Colliders ===
 
The top colliders in your Region can slow it down.  These are physical objects that are often moving and can contribute significantly to the time your Region takes to perform the physics.  In the Statistics Bar the Physics Time line shows how many milliseconds your physics is taking. If it is over 3 milliseconds then it may be worth investigating if this can be reduced.  Too see which colliders are the most active, in your Region / Estate Window, select the Debug Tab as shown below.
 
[[Image:Region_Window_Debug_Tab.PNG|thumbnail|none]]
 
Then click on Get Top Colliders, which will bring up a Window shown below.
 
[[Image:Region_Window_Top_Colliders.PNG|thumbnail|none]]
 
Also note that removing the total number of moving objects in your Region can improve performance.
 
=== Remove Large Images ===
 
Large images greater than 512 x 512 can slow down a Region.  When an avatar views a large image or numerous smaller images for the first time since entering the Region, they will automatically download the image to their Viewer.  If a lot of  about of avatar's are doing this at the same time then this will put a significant load on your Region, slowing down its FPS.
 
Note: is this network or texture FPS in the Statistics Bar?
 
=== Optimize Scripted Texture Changing Objects ===
 
Scripted objects that change textures can also slow down a Region.  Each time a new texture is displayed, it must be downloaded to each Avatar who is looking at the object. If you can't remove these objects then reducing the number of unique textures and size of the textures in these objects can increase your Region's performance.
 
=== Remove Big Prims ===
 
Big Prims greater than 10 m x 10 m can cause lag.  Removing or reducing these in your Region can increase its performance.
 
=== Reduce the Number of Prims Used ===
 
Reducing the number of prims your Region uses will increase your Region's performance.  Region's are currently limited to 16,XXXX Prims.
 
=== Reduce Number of Objects ===
 
Large numbers of objects, especially if they are moving or scripted will slow your Region.
 
=== Upgrade Your Region ===
 
There are different classes of Regions with different levels of performance. The fastest class of Region (Sim) allows you to have more simultaneous avatars, more scripts, more physics, more prims and more textures in your Region at one time.  Upgrading can allow you to do more within your Region. Class 5 Sim/Region's were introduced in November 2006 with all new Sim/Region's thereafter being class 5.  Class 5 Regions/Sims are described in [http://blog.secondlife.com/2006/10/16/looking-forward-to-class-5/ Ian's post].  All new Regions sold are class 5 and the class is specified when we deliver it to you.

Latest revision as of 08:31, 11 January 2010

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