Speed up /videoplayback streaming

src/invidious.cr

@@ -1051,20 +1051,19 @@ get "/videoplayback*" do |env|
 
       env.response.headers["Access-Control-Allow-Origin"] = "*"
 
-      chunk = Bytes[8]
-
-      loop do
-        count = response.body_io.read(chunk)
-
       begin
-          env.response.write(chunk)
+        chunk_size = 4096
+        size = 1
+        while size > 0
+          size = IO.copy(response.body_io, env.response.output, chunk_size)
           env.response.flush
+          Fiber.yield
+        end
       rescue ex
         break
       end
     end
   end
-  end
 end
 
 get "/user/:user" do |env|