Delivering Performance in a Blink - DroidCon India 2025

Transcript

1. Delivering
 performance in a blink
2. India’s Last Minute App Leading quick-commerce platform, delivering groceries and essentials in minutes. 1st in Food 
& Drinks 26M+ app opens 100M+ downloads 3.5M+ transacting users 9K+ unique devices 3M+ media served
3. Fixing the Basics Crashes Brotli Compression Baseline Profiles View Stubs R8 ANRs
4. Golden Metrics App Launch to Feed Render Scroll Performance Finding the cracks
5. App Launch to Feed Render
6. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
7. Application Creation
8. Application Creation
9. SAVED ~430ms
10. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
11. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
12. SPLASH FEED Activity Launch
13. Splash & Feed Merge SAVED ~80ms
14. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
15. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
16. Location Fetching Activity Launch Location Fetching Feed API Call GPS
17. Location Fetching Activity Launch Location Fetching Feed API Call WiFi Cache GPS
18. GPS Cache 59.2% 40.8% SPLIT GPS Cache 0 500 1000 1500 2000 2500 2294 ms 180 ms TIME SAVED ~2s
19. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
20. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
21. Feed Flow + ~1s API Call ~550ms Parsing + ~1.2s Rendering OkHttp GSON View
22. Feed API Call Location Fetching TCP ~110ms TLS ~70ms Feed API Call ~1s Feed Parsing DNS ~20ms Write Request Read Response
23. Pre-Warm OkHttp Connection Pool Single OkHttp Client What we did?
24. Feed API Call Location Fetching TCP ~110ms TLS ~70ms Feed Parsing DNS ~20ms Write Request Read Response Feed API Call ~1s
25. Feed API Call Ping API Call ~200ms Feed Parsing TCP ~110ms TLS ~70ms DNS ~20ms Write Request Read Response Location Fetching Feed API Call ~800ms
26. SAVED ~200ms
27. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
28. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
29. Feed Parsing Optimising GSON Lazy Parsing
30. Gson Deserialization: Under the Hood Inspect classes at runtime using reflection Mapping fields to JSON names Recursively parsing nested JSON objects Java/Kotlin Object Construction Create TypeAdapter to read values
31. Inspect classes at runtime using reflection Mapping fields to JSON names Create TypeAdapter to read values Recursively parsing nested JSON objects Java/Kotlin Object Construction Gson Deserialization: Under the Hood
32. SAVED ~190ms Pre-Warm TypeAdapter Cache Single GSON Instance What we did?
33. Feed Parsing
34. OLD Feed Parsing
35. NEW Lazy Parsing OLD
36. SAVED ~270ms
37. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
38. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
39. Feed Rendering
40. Feed Rendering Feed API Call Feed Parsing Feed Rendering
41. Feed Rendering Feed API Call Feed Parsing Feed Rendering Create views on IO thread Add to View Pool
42. SAVED ~360ms
43. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
44. App Launch to Feed Render Application Creation Activity Launch Location Fetching Feed Rendering Feed API Call Feed Parsing
45. Let’s Take a Look OLD NEW ~6.1s ~2.3s 🚀
46. Scroll Performance
47. Frame Rate & Jank Frame Rates Janky Frame
48. Scroll Performance
49. Too many texts
50. Android TextView
51. Blinkit TextView Static Layout & Boring Layout Text Layout Cache Warming Text
52. Blinkit TextView TextView rendering time reduced by >70% NEW BlinkitTextView OLD AppCompatTextView
53. Android Resources
54. Android Resources R.array.products R.color.black R.string.blink R.dimen.corner
55. RecyclerView Decorations OLD ~1500ms
56. NEW ~410ms Resource Caching OLD ~1500ms
57. OLD Scroll Performance
58. OLD NEW Scroll Performance
59. Dynamic Feed
60. Dynamic Feed
62. Average to Low End Devices
63. https://github.com/grofers/droid-dex
64. Droid Dex
65. Average Device Lottie High-End Device Video Low-End Device Image Picking the Right Media
66. Dynamic Image Resolution 360p resolution Low-End Device 720p resolution Average Device 1080p resolution High-End Device
67. And few more... Balance Number of Media Elements on Screen Prioritise Core Functionality over Delight Smarter Cache Sizing
68. NEW OLD OLD NEW
69. Cheers!!!
70. Signing off... Questions ??