This article introduces scene sizes and estimated download times for creators developing AR scenes on the STYLY mobile app. It provides guidelines for efficient scene size design based on actual carrier network speeds.
Why is Scene Size Important?
Smartphone users tend to have a high dropout rate when download times are long.
According to Think with Google, “53% of visitors leave a site if it takes more than 3 seconds to load.” Long download times increase user dropouts.
Optimizing scene size can reduce dropouts and increase the number of experiences.
Mobile site load time statistics – Think with Google
Recommended Download Time
Recommended download time: within 3 seconds
Download Time and Network Speed
Download time varies significantly depending on carrier network speeds. Below are calculations of download times (in seconds) for Android and iOS based on docomo’s actual speed data.
For Android
|
Scene Size (MB) |
100MB |
75MB |
50MB |
|
Maximum (761Mbps) |
1.05 sec |
0.79 sec |
0.53 sec |
|
75% (242Mbps) |
3.31 sec |
2.48 sec |
1.65 sec |
|
Median (85Mbps) |
9.41 sec |
7.06 sec |
4.71 sec |
|
25% (34Mbps) |
23.53 sec |
17.65 sec |
11.76 sec |
|
Minimum (3Mbps) |
266.67 sec |
200.00 sec |
133.33 sec |
For iOS
|
Scene Size (MB) |
100MB |
75MB |
50MB |
|
Maximum (818Mbps) |
0.98 sec |
0.73 sec |
0.49 sec |
|
75% (289Mbps) |
2.77 sec |
2.08 sec |
1.38 sec |
|
Median (112Mbps) |
7.14 sec |
5.36 sec |
3.57 sec |
|
25% (39Mbps) |
20.51 sec |
15.38 sec |
10.26 sec |
|
Minimum (2Mbps) |
400.00 sec |
300.00 sec |
200.00 sec |
Calculation Formula
Scene size (MB) / (download speed (Mbps) × 0.125)
0.125: Conversion factor (1Mbps = 0.125MBps)
Example Calculation:
For a data size of 100MB and a speed of 85Mbps:
100 / (85 × 0.125) = 100 / 10.625 = 9.41 sec
Recommended Scene Size
For Android: 31.88MB or less
For a median speed of 85Mbps, keep the scene size within 3 seconds.
For iOS: 42.0MB or less
For a median speed of 112Mbps, keep the scene size within 3 seconds.
If you aim to stay under 3 seconds with median network speeds, 42MB is a good benchmark. Keep the scene size under 100MB overall for optimal performance.