
The following notes were taken from the Tuesday, July 29th, 2025 Simulator User Group (SUG) off-week meeting (which I’ll be referring to as the “SUG Leviathan Hour” going forward). These notes form a summary of the items discussed, and are not intended to be a full transcript. The notes were taken from my chat log of the meeting and Patera’s video, which is embedded at the end of this article – my thanks to her for providing it.
Meeting Overview
- The Simulator User Group (also referred to by its older name of Server User Group) exists to provide an opportunity for discussion about simulator technology, bugs, and feature ideas is held every other Tuesday at 12:00 noon, SLT (holidays, etc., allowing), per the Second Life Public Calendar.
- The “SUG Leviathan Hour” meetings are held on the Tuesdays which do not have a formal SUG meeting, and are chaired by Leviathan Linden. They are more brainstorming / general discussion sessions.
- Meetings are held in text in-world, at this location.
Simulator Deployments
- There are no planned deployments to any channels this week, only restarts.
In Brief
Also refer to the video for the full meeting.
- Leviathan has turned his attention back to the issue of some people experiencing failures on logging-in, which he describes thus:
So… the problem is the login.cgi computes a big “viewer return value” (aka the VRV) which it sends back [to the viewer]. It has “Content-type: llsd+xml” header on it, and can be several MB in size. It contains, among other things, the list of your friends, groups, and a skeleton summary of all of your inventory folders. When the data package is very big and your download rate is low… it can take a while for it to arrive. If it takes too long the viewer can timeout on the request… even though login.cgi thought it “succeeded” and sent an alert to the Region where you were supposed to arrive.
– Leviathan Linden
Leviathan believe one aspect that makes the VRV so big is the number of folders within inventory (not the contents of folders, just the count of folders). However, Leviathan believes he has a solution (which is pending deployment):
So anyway: a relatively simple change on the login server allows the data to be gzipped, which can speed up the transmission … The Second Life Viewer (SLV) uses libcurl for its http requests, and it can handle gzipped data implicitly. Any viewer that picked up that capability from SLV should see benefits when login gets the update.
– Leviathan Linden
- Another issue Leviathan is looking into a bug where Premium+ users can’t upload mesh for L$0 after crossing a region boundary, although he hasn’t found a root cause as yet.
- There is apparently some exploratory work going on with in the engineering team(s) on the potential to use AI tools for code generation.
- An update to SLua is in development, and might be deployed to Aditi (the beta grid) in the next week or so.
- A general discussion on the (currently stalled) game_control project. As noted in my previous Leviathan Hour summary, the game_control work (and the work for a Linux version of the SL Viewer) is currently archived during the most recent switch to the viewer development and release workflow.
- A Function to Detect Right click (which has it own debate) was raised. Leviathan Linden noted there subject is stalled. This led to an extended discussion on the ticket, and the issue(s) it encompasses. This discussion extended to one on Touch Pointer Capture, together with ideas for extended mouse hover operations, and expanded use of the mouse scroll wheel.
Date of Next Meetings
- Formal SUG meeting: Tuesday, August 5th, 2025.
- Leviathan Linden: Tuesday, August 26th, 2025, due to Leviathan being on vacation (unless he can find a volunteer to fill-in for him).
† The header images included in these summaries are not intended to represent anything discussed at the meetings; they are simply here to avoid a repeated image of a rooftop of people every week. They are taken from my list of region visits, with a link to the post for those interested.







