Is Sinatra multi-threaded? I read else where that "sinatra is multi-threaded by default", what does that imply?

Consider this example

get "/multithread" do
  t1 = Thread.new{
    puts "sleeping for 10 sec"
    sleep 10
    # Actually make a call to Third party API using HTTP NET or whatever.
  }
  t1.join
  "multi thread"
end

get "/dummy" do
  "dummy"
end

If I access "/multithread" and "/dummy" subsequently in another tab or browser then nothing can be served(in this case for 10 seconds) till "/multithread" request is completed. In case activity freezes application becomes unresponsive.

How can we work around this without spawning another instance of the application?

ruby sinatra
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