update doc

docs/src/index.md

@@ -208,12 +208,9 @@ A `LazyBufferCache` is a `Dict`-like type for the caches, which automatically de
 new cache arrays on demand when they are required. The function `f` maps
 `size_of_cache = f(size(u))`, which by default creates cache arrays of the same size.
 
-Note that `LazyBufferCache` does cause a dynamic dispatch, though it is type-stable.
-This gives it a ~100ns overhead, and thus on very small problems it can reduce
-performance, but for any sufficiently sized calculation (e.g. >20 ODEs) this
-may not be even measurable. The upside of `LazyBufferCache` is that the user does
-not have to worry about potential issues with chunk sizes and such: `LazyBufferCache`
-is much easier!
+Note that `LazyBufferCache` is type-stable and contains no dynamic dispatch. This gives
+it a ~15ns overhead. The upside of `LazyBufferCache` is that the user does not have to
+worry about potential issues with chunk sizes and such: `LazyBufferCache` is much easier!
 
 ### Example
 
@@ -319,7 +316,7 @@ tries to do this with a bump allocator.
 
   - See the [SciML Style Guide](https://github.com/SciML/SciMLStyle) for common coding practices and other style decisions.
   - There are a few community forums:
-    
+
       + The #diffeq-bridged and #sciml-bridged channels in the
         [Julia Slack](https://julialang.org/slack/)
       + The #diffeq-bridged and #sciml-bridged channels in the