What bugs and what lags? Please give us reproducible steps and a description of the bugs.
Perhaps if the collective gets more information
All recent updates were done to improve certain aspects. Software is a continuous cycle of finding, fixing and improving it.
It is accurate that you need to download resources to the cache on first join. Depending on the server, which the collective have no control over, this can take a short or long amount of time. Downloading content for 20 minutes can have a couple of causes, for example:
a) You have a slow connection to the server (due to you or the server bandwidth)
b) There are a lot of resources resulting you having to download 100s of MB. This is particularly common for servers that have a lot of custom models like vehicles.
And what kind of crash? Can we see your logs? You received a support template when creating this topic but you completely ignored it. You cannot expect anything to be fixed without giving any valuable information!
This, again, can have a couple of reasons. For example:
a) You have a slow computer
b) You have a lot of other open programs consuming a large amount of CPU causing the GTA world to not render quick enough
c) A broken map on the server
d) and many more…
Exactly, what is this? We don’t have a 
to look into and know exactly what happened. Again, more information!
If you are serious, I want you to now fill out the Technical Support template . Don’t just scream like a baby hoping for your issues to be fixed.