# File lib/mini_profiler/storage/memory_store.rb, line 107
      def cleanup_cache
        expire_older_than = ((Time.now.to_f - @expires_in_seconds) * 1000).to_i
        @timer_struct_lock.synchronize {
          @timer_struct_cache.delete_if { |k, v| v[:started] < expire_older_than }
        }
      end