Your app works slowly. Now what?

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You did great job finishing this web app on time and budget. Design patterns, good code coverage, cutting edge frameworks and best CI ever. It goes to production and boom, clients complain it's too slow. They don't really care, if it's best engineering ever, if each view loads 4 seconds. My presentation will give you hints on how to look for bottlenecks. I will also share simple tricks to make the app work faster, or at least seem to work faster.

Engineering

Your app works slowly.
Now what?
Ola Kunysz

I’ve been doing software since 2007 
I did coding in Java, Scala, JS, #C, Python…  
and COBOL
I work in e-commerce
Hello.
@OlaQnysz

Let’s assume user
• wants to give you money / time / energy
• is impatient
• has priorities

Your app
•clean code
•it's SOLID
•modern SPA
•hipster frameworks ’19
•it's beautiful

Why you should care?
Two
As page load time goes
from 1 to 5 s,  
the probability of bounce
increases 90%
Source: Google/SOASTA Research, 2017.
One Three
You want your client happy  It’s you goddamn duty 
Everyone is a performance engineer(Be aware she can move  
in any direction)

• Monitoring
• Data load
• Getting dynamic
Improving
performance

How does it feel  
to be a user?
• On mobile
• With slow 3G
• In hurry
• With different OS (BrowserStack)

$for i in `seq 1 10`; do curl -XGET -s -o /dev/null -w "%{time_total}" “http://localhost:9000/v3/shops/olas"; echo; done; API Monitoring$

One way
Webpack Bundle Analyzer
• installed with npm or yarn
• generates json file
• runs interactive tree map

Dynamic imports
import modules on-demand (or conditionally)
preload vs prefetch

Paging data
• Infinite scroll
• Paging
• Load more
/products?skip=0&take=20
/products?skip=0&take=1000
200 ms
6000 ms

Change vs Update
ReplaceOne vs UpdateOne
days vs hours
(earlier it was good enough)

Caching on CDN
• theme files
• CSS files
• images
• videos
• scripts

Loading right images
handle sizes and be kind to mobiles

CSS and JS
• minified
• nonblocking
• concatenated
• compressed

Optimistic
updates
(where you can tolerate the risk)

Monitor Improve experience
Feel the pain
Spot the bottlenecks
Lighthouse
Shrink and page
Import dynamically
Update not change
Serve data locally
Use frontend tricks
Optimise graphics
Limit data load

• Improve everything
• Stop development
• Premature optimisation
• Tools before ideas
What you
should not do

Congrats!
Now you know how to boost performance of your application

If you want more
https://unbounce.com/landing-pages/7-page-speed-stats-for-marketers/  
https://www.machmetrics.com/speed-blog/average-page-load-times-websites-2018/  
https://think.storage.googleapis.com/docs/mobile-page-speed-new-industry-benchmarks.pdf  
https://www.smashingmagazine.com/2016/03/pagination-infinite-scrolling-load-more-buttons/  
https://developers.google.com/drive/api/v3/performance  
https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching  
http://www.apiacademy.co/how-to-http-caching-for-restful-hypermedia-apis/  
https://www.mongodb.com/blog/post/improving-mongodb-performance-with-automatically-generated-index-suggestions  
https://medium.com/front-end-hacking/webpack-and-dynamic-imports-doing-it-right-72549ff49234  
http://laurent.bristiel.com/getting-started-with-gatling-for-stress-test/  
https://webpack.js.org/guides/code-splitting/#prefetching-preloading-modules  
https://prometheus.io/docs/introduction/first_steps/  
https://travishorn.com/why-it-is-better-to-serve-site-assets-from-multiple-domains-972a2bf69d71  
https://www.boredpanda.com/england-queen-brooch-trolling-donald-trump

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As digital technology becomes more deeply embedded in power systems, protecting the communication networks of Smart Grids (SG) has emerged as a critical concern. Distributed Network Protocol 3 (DNP3) represents a multi-tiered application layer protocol extensively utilized in Supervisory Control and Data Acquisition (SCADA)-based smart grids to facilitate real-time data gathering and control functionalities. Robust Intrusion Detection Systems (IDS) are necessary for early threat detection and mitigation because of the interconnection of these networks, which makes them vulnerable to a variety of cyberattacks. To solve this issue, this paper develops a hybrid Deep Learning (DL) model specifically designed for intrusion detection in smart grids. The proposed approach is a combination of the Convolutional Neural Network (CNN) and the Long-Short-Term Memory algorithms (LSTM). We employed a recent intrusion detection dataset (DNP3), which focuses on unauthorized commands and Denial of Service (DoS) cyberattacks, to train and test our model. The results of our experiments show that our CNN-LSTM method is much better at finding smart grid intrusions than other deep learning algorithms used for classification. In addition, our proposed approach improves accuracy, precision, recall, and F1 score, achieving a high detection accuracy rate of 99.50%.

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DEEP LEARNING FOR SMART GRID INTRUSION DETECTION: A HYBRID CNN-LSTM-BASED MODEL

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Your app works slowly. Now what?

1. Your app works slowly. Now what? Ola Kunysz

2. I’ve been doing software since 2007  I did coding in Java, Scala, JS, #C, Python…   and COBOL I work in e-commerce Hello. @OlaQnysz

3. Let’s assume user • wants to give you money / time / energy • is impatient • has priorities

4. Your app •clean code •it's SOLID •modern SPA •hipster frameworks ’19 •it's beautiful

5. Why you should care? Two As page load time goes from 1 to 5 s,   the probability of bounce increases 90% Source: Google/SOASTA Research, 2017. One Three You want your client happy  It’s you goddamn duty  Everyone is a performance engineer(Be aware she can move   in any direction)

6. • Monitoring • Data load • Getting dynamic Improving performance

7. Monitoring

8. How does it feel   to be a user? • On mobile • With slow 3G • In hurry • With different OS (BrowserStack)

9. Show me the data +

10. Show me the data

11. Show me the data

12. Show me the data

13. Show me the data

18. for i in `seq 1 10`; do curl -XGET -s -o /dev/null -w "%{time_total}" “http://localhost:9000/v3/shops/olas"; echo; done; API Monitoring

19. If you don’t know the way

20. Data load

21. Problem?

22. One way Webpack Bundle Analyzer • installed with npm or yarn • generates json file • runs interactive tree map

23. Dynamic imports import modules on-demand (or conditionally) preload vs prefetch

24. Shrinking data 3 KB 0.5 KBvs

25. Paging data • Infinite scroll • Paging • Load more /products?skip=0&take=20 /products?skip=0&take=1000 200 ms 6000 ms

26. Change vs Update ReplaceOne vs UpdateOne days vs hours (earlier it was good enough)

27. Getting Dynamic

28. Caching on CDN • theme files • CSS files • images • videos • scripts

29. Loading right images handle sizes and be kind to mobiles

30. Serving from multiple domains

31. Load balancing

32. CSS and JS • minified • nonblocking • concatenated • compressed

33. Content placeholding

34. Content placeholding

35. Optimistic updates (where you can tolerate the risk)

36. Monitor Improve experience Feel the pain Spot the bottlenecks Lighthouse Shrink and page Import dynamically Update not change Serve data locally Use frontend tricks Optimise graphics Limit data load

37. One last thing

38. • Improve everything • Stop development • Premature optimisation • Tools before ideas What you should not do

39. Staycurious.

40. Congrats! Now you know how to boost performance of your application

41. If you want more https://unbounce.com/landing-pages/7-page-speed-stats-for-marketers/   https://www.machmetrics.com/speed-blog/average-page-load-times-websites-2018/   https://think.storage.googleapis.com/docs/mobile-page-speed-new-industry-benchmarks.pdf   https://www.smashingmagazine.com/2016/03/pagination-infinite-scrolling-load-more-buttons/   https://developers.google.com/drive/api/v3/performance   https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching   http://www.apiacademy.co/how-to-http-caching-for-restful-hypermedia-apis/   https://www.mongodb.com/blog/post/improving-mongodb-performance-with-automatically-generated-index-suggestions   https://medium.com/front-end-hacking/webpack-and-dynamic-imports-doing-it-right-72549ff49234   http://laurent.bristiel.com/getting-started-with-gatling-for-stress-test/   https://webpack.js.org/guides/code-splitting/#prefetching-preloading-modules   https://prometheus.io/docs/introduction/first_steps/   https://travishorn.com/why-it-is-better-to-serve-site-assets-from-multiple-domains-972a2bf69d71   https://www.boredpanda.com/england-queen-brooch-trolling-donald-trump

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