Kenta, your track looked like this yesterday:

with yellow being slow and dark blue at 30kts (I cropped the legend off).
PM me your email address so I can attach larger files and send you more.
Your statistics were:
Total Distance = 9.085 Km , Average speed = 12.42km/h [6.7Knots] , Total Time = 43 minutes
5 bests' average = 52.68km/h [28.45Knots]
Best Speed n°1 = 55.62km/h [30.03Knots] (77.2 meters in 5.0 sec.)
Best Speed n°2 = 55.38km/h [29.9Knots] (153.8 meters in 10.0 sec.)
Best Speed n°3 = 51.03km/h [27.55Knots] (85.0 meters in 6.0 sec.)
Best Speed n°4 = 50.74km/h [27.4Knots] (98.7 meters in 7.0 sec.)
Best Speed n°5 = 50.64km/h [27.34Knots] (126.6 meters in 9.0 sec.)
Best Speed n°6 = 50.37km/h [27.2Knots] (70.0 meters in 5.0 sec.)
Best Speed n°7 = 50.1km/h [27.05Knots] (97.4 meters in 7.0 sec.)
Best Speed n°8 = 49.9km/h [26.95Knots] (41.6 meters in 3.0 sec.)
Best Speed n°9 = 49.61km/h [26.78Knots] (55.1 meters in 4.0 sec.)
Best Speed n°10 = 49.48km/h [26.72Knots] (110.0 meters in 8.0 sec.)
5 best 100 meter (at least) average = 51.87km/h [28.01Knots]
100 meter run n°1 = 55.38km/h [29.9Knots] (153.8 m. in 10.0 s.)
100 meter run n°2 = 52.99km/h [28.61Knots] (147.2 m. in 10.0 s.)
100 meter run n°3 = 50.88km/h [27.47Knots] (183.7 m. in 13.0 s.)
100 meter run n°4 = 50.64km/h [27.34Knots] (126.6 m. in 9.0 s.)
100 meter run n°5 = 49.48km/h [26.72Knots] (110.0 m. in 8.0 s.)
5 best 200 meter (at least) average = 50.11km/h [27.06Knots]
200 meter run n°1 = 55.46km/h [29.95Knots] (231.1 m. in 15.0 s.)
200 meter run n°2 = 50.45km/h [27.24Knots] (238.2 m. in 17.0 s.)
200 meter run n°3 = 50.41km/h [27.22Knots] (224.0 m. in 16.0 s.)
200 meter run n°4 = 48.63km/h [26.26Knots] (270.1 m. in 20.0 s.)
200 meter run n°5 = 45.6km/h [24.62Knots] (266.0 m. in 21.0 s.)
5 best 5 second (at least) average = 52.68km/h [28.45Knots]
5 second run n°1 = 55.62km/h [30.03Knots] (77.2 m. in 5.0 s.)
5 second run n°2 = 55.38km/h [29.9Knots] (153.8 m. in 10.0 s.)
5 second run n°3 = 51.03km/h [27.55Knots] (85.0 m. in 6.0 s.)
5 second run n°4 = 50.74km/h [27.4Knots] (98.7 m. in 7.0 s.)
5 second run n°5 = 50.64km/h [27.34Knots] (126.6 m. in 9.0 s.)
5 best 10 second (at least) average = 51.66km/h [27.9Knots]
10 second run n°1 = 55.38km/h [29.9Knots] (153.8 m. in 10.0 s.)
10 second run n°2 = 52.99km/h [28.61Knots] (147.2 m. in 10.0 s.)
10 second run n°3 = 50.88km/h [27.47Knots] (183.7 m. in 13.0 s.)
10 second run n°4 = 50.41km/h [27.22Knots] (224.0 m. in 16.0 s.)
10 second run n°5 = 48.66km/h [26.28Knots] (148.7 m. in 11.0 s.)