diff --git a/src/NoteField.cpp b/src/NoteField.cpp
index 4fa86c1003..60b0d9b6be 100644
--- a/src/NoteField.cpp
+++ b/src/NoteField.cpp
@@ -832,7 +832,7 @@ void NoteField::DrawPrimitives()
 	//LOG->Trace( "start = %f.1, end = %f.1", fFirstBeatToDraw-fSongBeat, fLastBeatToDraw-fSongBeat );
 	//LOG->Trace( "Drawing elements %d through %d", iFirstRowToDraw, iLastRowToDraw );
 
-#define IS_ON_SCREEN( fBeat )  IsOnScreen( fBeat, 0, iDrawDistanceAfterTargetsPixels, iDrawDistanceBeforeTargetsPixels )
+#define IS_ON_SCREEN( fBeat )  ( fFirstBeatToDraw <= (fBeat) && (fBeat) <= fLastBeatToDraw && IsOnScreen( fBeat, 0, iDrawDistanceAfterTargetsPixels, iDrawDistanceBeforeTargetsPixels ) )
 
 	// Draw board
 	if( SHOW_BOARD )
diff --git a/src/NotesLoaderSM.cpp b/src/NotesLoaderSM.cpp
index 4248085f67..f18c556056 100644
--- a/src/NotesLoaderSM.cpp
+++ b/src/NotesLoaderSM.cpp
@@ -932,7 +932,7 @@ void SMLoader::TidyUpData( Song &song, bool bFromCache )
 			bg.push_back( BackgroundChange(song.m_fLastBeat,song.m_sBackgroundFile) );
 		} while(0);
 	}
-	song.TidyUpData();
+	song.TidyUpData( bFromCache );
 }
 
 /*
diff --git a/src/Song.cpp b/src/Song.cpp
index de09e5ffa3..1e737ef182 100644
--- a/src/Song.cpp
+++ b/src/Song.cpp
@@ -236,9 +236,7 @@ bool Song::LoadFromSongDir( RString sDir )
 	{
 //		LOG->Trace( "Loading '%s' from cache file '%s'.", m_sSongDir.c_str(), GetCacheFilePath().c_str() );
 		bool bLoadedFromSSC = SSCLoader::LoadFromSSCFile( sCacheFilePath, *this, true );
-		if( bLoadedFromSSC )
-			SSCLoader::TidyUpData( *this, true );
-		else
+		if( !bLoadedFromSSC )
 		{
 			// load from .sm
 			SMLoader::LoadFromSMFile( sCacheFilePath, *this, true );
@@ -390,7 +388,7 @@ void FixupPath( RString &path, const RString &sSongPath )
 }
 
 // Songs in BlacklistImages will never be autodetected as song images.
-void Song::TidyUpData()
+void Song::TidyUpData( bool bFromCache )
 {
 	// We need to do this before calling any of HasMusic, HasHasCDTitle, etc.
 	ASSERT_M( m_sSongDir.Left(3) != "../", m_sSongDir ); // meaningless
@@ -481,7 +479,7 @@ void Song::TidyUpData()
 
 	/* Generate these before we autogen notes, so the new notes can inherit
 	 * their source's values. */
-	ReCalculateRadarValuesAndLastBeat();
+	ReCalculateRadarValuesAndLastBeat( bFromCache );
 
 	Trim( m_sMainTitle );
 	Trim( m_sSubTitle );
@@ -791,8 +789,16 @@ void Song::TranslateTitles()
 	title.SaveToStrings( m_sMainTitle, m_sSubTitle, m_sArtist, m_sMainTitleTranslit, m_sSubTitleTranslit, m_sArtistTranslit );
 }
 
-void Song::ReCalculateRadarValuesAndLastBeat()
+void Song::ReCalculateRadarValuesAndLastBeat( bool bFromCache )
 {
+	if( bFromCache && m_fFirstBeat >= 0 && m_fLastBeat > 0 )
+	{
+		// this is loaded from cache, then we just have to calculate the radar values.
+		for( unsigned i=0; i<m_vpSteps.size(); i++ )
+			m_vpSteps[i]->CalculateRadarValues( m_fMusicLengthSeconds );
+		return;
+	}
+
 	float fFirstBeat = FLT_MAX; // inf
 	float fLastBeat = m_fSpecifiedLastBeat; // Make sure we're at least as long as the specified amount.
 
diff --git a/src/Song.h b/src/Song.h
index 0539cddff5..cbe6e5ddf4 100644
--- a/src/Song.h
+++ b/src/Song.h
@@ -97,13 +97,13 @@ public:
 	bool ReloadFromSongDir( RString sDir );
 
 	/** @brief Call this after loading a song to clean up invalid data. */
-	void TidyUpData();
+	void TidyUpData( bool bFromCache = false );
 	
 	/**
 	 * @brief Get the new radar values, and determine the last beat at the same time.
 	 *
 	 * This is called by TidyUpData, after saving the Song. */
-	void ReCalculateRadarValuesAndLastBeat();
+	void ReCalculateRadarValuesAndLastBeat( bool bFromCache = false );
 	/**
 	 * @brief Translate any titles that aren't in english.
 	 *
diff --git a/src/Steps.cpp b/src/Steps.cpp
index de2634e83c..c1a79064f5 100644
--- a/src/Steps.cpp
+++ b/src/Steps.cpp
@@ -31,7 +31,8 @@ Steps::Steps(): m_StepsType(StepsType_Invalid),
 	m_sNoteDataCompressed(""), m_sFilename(""), m_bSavedToDisk(false), 
 	m_LoadedFromProfile(ProfileSlot_Invalid), m_iHash(0),
 	m_sDescription(""), m_sChartStyle(""), 
-	m_Difficulty(Difficulty_Invalid), m_iMeter(0), m_sCredit("") {}
+	m_Difficulty(Difficulty_Invalid), m_iMeter(0), m_sCredit(""),
+	m_bAreCachedRadarValuesJustLoaded(false) {}
 
 Steps::~Steps()
 {
@@ -171,6 +172,12 @@ void Steps::CalculateRadarValues( float fMusicLengthSeconds )
 	if( parent != NULL )
 		return;
 
+	if( m_bAreCachedRadarValuesJustLoaded )
+	{
+		m_bAreCachedRadarValuesJustLoaded = false;
+		return;
+	}
+
 	// Do write radar values, and leave it up to the reading app whether they want to trust
 	// the cached values without recalculating them.
 	/*
@@ -422,6 +429,7 @@ void Steps::SetCachedRadarValues( const RadarValues v[NUM_PLAYERS] )
 {
 	DeAutogen();
 	copy( v, v + NUM_PLAYERS, m_CachedRadarValues );
+	m_bAreCachedRadarValuesJustLoaded = true;
 }
 
 bool Steps::UsesSplitTiming() const
diff --git a/src/Steps.h b/src/Steps.h
index 1e107f7db4..8ba508b9d2 100644
--- a/src/Steps.h
+++ b/src/Steps.h
@@ -180,6 +180,7 @@ private:
 	int				m_iMeter;
 	/** @brief The radar values used for each player. */
 	RadarValues			m_CachedRadarValues[NUM_PLAYERS];
+	bool                m_bAreCachedRadarValuesJustLoaded;
 	/** @brief The name of the person who created the Steps. */
 	RString				m_sCredit;
 };
diff --git a/src/TimingData.cpp b/src/TimingData.cpp
index 0f70041bc8..1e57e455ac 100644
--- a/src/TimingData.cpp
+++ b/src/TimingData.cpp
@@ -1003,14 +1003,19 @@ float TimingData::GetElapsedTimeFromBeatNoOffset( float fBeat ) const
 
 float TimingData::GetDisplayedBeat( float fBeat ) const
 {
-	unsigned index = GetScrollSegmentIndexAtBeat(fBeat);
-	const ScrollSegment &s = m_ScrollSegments[index];
-	float fOutBeat = ( fBeat - s.GetBeat() ) * s.GetRatio();
-	for( unsigned i = 0; i < index; i ++ )
+	vector<ScrollSegment>::const_iterator it = m_ScrollSegments.begin(), end = m_ScrollSegments.end();
+	float fOutBeat = 0.0;
+	for( ; it != end; it++ )
 	{
-		const ScrollSegment &future = m_ScrollSegments[i+1];
-		const ScrollSegment &current = m_ScrollSegments[i];
-		fOutBeat += ( future.GetBeat() - current.GetBeat() ) * current.GetRatio();
+		if( it+1 == end || fBeat <= (it+1)->GetBeat() )
+		{
+			fOutBeat += ( fBeat - (it)->GetBeat() ) * (it)->GetRatio();
+			break;
+		}
+		else
+		{
+			fOutBeat += ( (it+1)->GetBeat() - (it)->GetBeat() ) * (it)->GetRatio();
+		}
 	}
 	return fOutBeat;
 }