diff --git a/spec/report_spec.cr b/spec/report_spec.cr
index 8c1b2ff..bc78a65 100644
--- a/spec/report_spec.cr
+++ b/spec/report_spec.cr
@@ -22,7 +22,7 @@ def new_report(successful_count = 5, failed_count = 5, error_count = 5, pending_
   error_count.times { results << new_failure_result(Spectator::ErroredResult) }
   pending_count.times { results << new_pending_result }
 
-  example_runtime = results.select(&.is_a?(Spectator::FinishedResult)).map(&.as(Spectator::FinishedResult)).sum(&.elapsed)
+  example_runtime = results.compact_map(&.as?(Spectator::FinishedResult)).sum(&.elapsed)
   total_runtime = example_runtime + Time::Span.new(nanoseconds: overhead_time)
   Spectator::Report.new(results, total_runtime)
 end
diff --git a/src/spectator/report.cr b/src/spectator/report.cr
index adac39b..b8c7d63 100644
--- a/src/spectator/report.cr
+++ b/src/spectator/report.cr
@@ -38,25 +38,19 @@ module Spectator
 
     # Returns a set of results for all failed examples.
     def failures
-      @results.select(&.is_a?(FailedResult)).map(&.as(FailedResult))
+      @results.compact_map(&.as?(FailedResult))
     end
 
     # Returns a set of results for all errored examples.
     def errors
-      @results.select(&.is_a?(ErroredResult)).map(&.as(ErroredResult))
+      @results.compact_map(&.as?(ErroredResult))
     end
 
     # Length of time it took to run just example code.
     # This does not include hooks,
     # but it does include pre- and post-conditions.
     def example_runtime
-      @results.sum do |result|
-        if result.is_a?(FinishedResult)
-          result.elapsed
-        else
-          Time::Span.zero
-        end
-      end
+      @results.each.compact_map(&.as?(FinishedResult)).sum(&.elapsed)
     end
 
     # Length of time spent in framework processes and hooks.