Faster preset in use
You have changed the default preset to superfast. The default of veryfast is designed for the optimum balance of quality and CPU usage. Using superfast will result in greatly reduced quality. If possible, try to change other things such as lowering the resolution or FPS before modifying the preset.
Dropped frames detected
57% of your frames were dropped due to poor network conditions. Frames are dropped when data can not be sent fast enough to the server you have selected. This is caused by trying to stream at too high of a bitrate, or by the streaming server you selected not being able to accept the data at the rate you are sending.
Try switching servers, especially if you are using twitch.tv. As a test, you could also try streaming to a different provider to check whether the problem is on your end or not.
Note that some ISPs will temporarily increase your upload speed at the start of a transfer - if you only start to drop frames after 30 - 60 seconds, your ISP is likely doing this and you will need to use a lower bitrate.
Finally, if you are using a wireless connection, keep in mind that interference from other radio sources can cause your connection to stutter and drop frames. A wired connection is strongly recommended when streaming.
See
https://obsproject.com/forum/viewtopic.php?f=5&t=8870 for more advice on how to fix dropped frames.
Connection stalls detected
Your connection is stalling while sending data. This can result in frame drops, stream freezes and disconnects. Try changing the server you are streaming to, or lowering your bitrate
3 issues found (2 major, 1 minor).