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Secrets to Lightning-
Fast Mobile Design
Warm Gun 2011
Mike Krieger
Instagram
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me
- Co-founder, Instagram
- Previously: UX & Front-end
@ Meebo
- Stanford HCI BS/MS
- @mikeyk on everything
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12 million users in 12
months
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“Fast, beautiful photo
sharing”
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“Fast, beautiful photo
sharing”
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making your mobile
experiences feel
lightning-fast
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not the code, but the
experience
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mobile design requires
the ultimate in design &
development
collaboration
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speed matters
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mobile experiences fill
gaps while we wait
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no one wants to wait
while they wait
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JSON parsing
UITableViewCell
HTTP pipelining
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creative design decisions
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how speed can be a
design feature
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how design can be a
speed feature
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implementation details
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details that need to be
designed
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3 secrets to apps that
feel lightning-fast, even
on 3G
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1. perform actions optimistically
2. adaptively pre-load content
3. move bits when no-one’s watching
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perform actions
optimistically
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latency is what’ll get ya
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make the user feel
productive
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request
is going, but
we register the
like
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request
is going, but
we register the
comment
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if it fails?
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why it works
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@thesarahnator
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@stayintheshade
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adaptive pre-loading
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basic version: load
content before it’s
needed
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“let’s load all the images
in the feed once the user
loads the page”
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fresh feed
30 photos to load
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pitfall
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instead...
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re-prioritize based on
interest
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listen to what their flicks
& taps are telling you
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why it works
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@miriamjasmine
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move bits when
no-one’s watching
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sign-up
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?
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upload
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most apps upload here
we start uploading here
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non-optimal engineering
solution
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2 requests, 2 round-trips
+ latency
need to match up
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but makes uploads feel
really, really quick
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send data/info as soon
as part of it’s ready to go;
match up later
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worth it even if you throw
out the data on cancel
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why it works
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where to go from here
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“it works” isn’t enough
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design & development
collaboration
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1. perform actions optimistically
2. adaptively pre-load content
3. move bits when no-one’s watching
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