Update README with async and performance information

Added notes on asynchronous methods and performance tips.

Signed-off-by: Omena0 <Omena0MC@gmail.com>

Author: Omena0

README.md

@@ -13,11 +13,20 @@ async def helloworld(event: Event):
 ```
 
 The entire API is, at core, asynchronous.
+Though you do not need to await any methods unless you want to wait for the call to complete.
 
 ## Documentation
 
 See [The Docs](https://omena0.github.io/PyJavaBridge/index.html)
 
+For quick searches use the pjb cli script.
+
+## Performance
+
+Currently the performance is suboptimal, the current bottleneck is the bridge itself.
+You should avoid doing anything that sends many requests over the bridge.
+If possible you should always use `server.frame()` to batch requests.
+
 ## Changelog
 
 See [changelog.md](changelog.md)