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# Startup performance
The following is meant as overview of startup execution performance. It should be noted that this data is at high risk of becoming out-of-date, but this can still serve as an introduction to the cost of the work being done during startup. It is always recommended to familiarize yourself with recently captured performance profiles to get a more accurate understanding.
```{mermaid}
gantt
title App Initialization Timeline (ms view)
dateFormat ss.SSS
axisFormat %S.%L
section FenixApplication
init :a0, 00.000, 0.001s
onCreate :a1, after a0, 0.150s
Install crash reporter :a2, 00.010, 0.001s
Initialize Nimbus (and megazord) :a3, after a2, 0.060s
GeckoEngine warmUp() :a4, after a3, 0.010s
Initialize BrowserStore :a5, after a4, 0.010s
Initialize Glean :a6, after a5, 0.010s
Initialize web extension support :a7, after a6, 0.005s
Finish megazord setup (Rust HTTP) :a8, after a7, 0.001s
Warm BrowsersCache :a9, after a8, 0.001s
Global app services providers :a10, after a9, 0.005s
Setup Push :a11, after a10, 0.005s
Records metrics :a12, after a11, 0.020s
section IntentReceiverActivity
onCreate :i1, after a1, 0.035s
section HomeActivity
onCreate :h1, after i1, 0.070s
onStart :h2, after b1, 0.160s
section BrowserFragment
onCreateView :b1, after h1, 0.50s
Tab preview created :b2, after h1, 0.025s
Toolbar view initialization :b3, after b2, 0.020s
onStart :b4, after h2, 0.020s
section Background Threads
Glean initialized :w, after a2, 0.150s
Nimbus Database :w0, after a2, 0.060s
Room db (recently closed) :w1, after w0, 0.070s
Room db (downloads) :w2, after w1, 0.060s
Room db (crashes) :w3, after w2, 0.050s
section Gecko
Gecko thread runs :g0, after a4, 1s
section Gpu Process
Render thread runs :r1, after g0, 1.100s
section Tab Process
Some web content work :t1, after g0, 0.100s
```
## Update log:
- 2025-05-06
Diagram initially synthesized from the following profiles: