Index: utils/ofhttp/ProgressBar.h
==================================================================
--- utils/ofhttp/ProgressBar.h
+++ utils/ofhttp/ProgressBar.h
@@ -17,23 +17,27 @@
 
 #import "OFObject.h"
 
 @class OFDate;
 @class OFTimer;
+
+#define BPS_WINDOW_SIZE 10
 
 @interface ProgressBar: OFObject
 {
 	intmax_t _received, _lastReceived, _length, _resumedFrom;
 	OFDate *_startDate, *_lastReceivedDate;
 	OFTimer *_drawTimer, *_BPSTimer;
 	bool _stopped;
 	float _BPS;
 	double _ETA;
+	float _BPSWindow[BPS_WINDOW_SIZE];
+	size_t _BPSWindowIndex, _BPSWindowLength;
 }
 
 - (instancetype)initWithLength: (intmax_t)length
 		   resumedFrom: (intmax_t)resumedFrom;
 - (void)setReceived: (intmax_t)received;
 - (void)draw;
 - (void)calculateBPSAndETA;
 - (void)stop;
 @end

Index: utils/ofhttp/ProgressBar.m
==================================================================
--- utils/ofhttp/ProgressBar.m
+++ utils/ofhttp/ProgressBar.m
@@ -254,12 +254,22 @@
 		[self _drawReceived];
 }
 
 - (void)calculateBPSAndETA
 {
-	_BPS = (float)(_received - _lastReceived) /
+	_BPSWindow[_BPSWindowIndex++ % BPS_WINDOW_SIZE] =
+	    (float)(_received - _lastReceived) /
 	    -(float)_lastReceivedDate.timeIntervalSinceNow;
+
+	if (_BPSWindowLength < BPS_WINDOW_SIZE)
+		_BPSWindowLength++;
+
+	_BPS = 0;
+	for (size_t i = 0; i < _BPSWindowLength; i++)
+		_BPS += _BPSWindow[i];
+	_BPS /= _BPSWindowLength;
+
 	_ETA = (double)(_length - _received) / _BPS;
 
 	_lastReceived = _received;
 	[_lastReceivedDate release];
 	_lastReceivedDate = [[OFDate alloc] init];