Www.chromium.org

Performance in Context

The execution of a web browser primarily involves three tasks: fetching resources, page layout and rendering, and JavaScript execution. That said, optimizing the last two tasks won’t do much good if the browser is blocked on the network, waiting for resources to arrive.

Of the top 100K, the median page on desktop requests 97 resources weighing 2,954KB in total, and makes 16 TCP connections . While the underlying transport (TCP) is optimized for large, streaming downloads, most network transfers in the browser are short and bursty.

Stability, Testing and the Multi-Process Architecture

In a single-threaded browser, devs use asynchronous APIs - which may sometimes hold the browser up. Instead of multiple threads, Chromium chose multiple processes: isolation, independent crashes, better asymptotic memory management, identifying expensive sites, etc.

Unscoped (or Plain or C-Style) Enumerations

Plain (or C-style) enums are entered in the same scope as the name of their enum, and implicitly convert to their integer value, e.g.

enum Color { red, green, blue };
int col = green;
Color c2 = 1; // error: invalid conversion from 'int' to 'Color' [-fpermissive]

enum CardColor { red, black }; // Error: "red" conflicts with a previous declaration

The name can be omitted if it’s not going to be used, e.g.

enum { red, green, blue };
int col = red;

.

Unnamed enums are common in code written before alternative ways of specifying integer constants, e.g.

Link to Original Video

ML Usefulness to a Dev

• Reduce time spent programming, e.g. manually crafted spellchecker with rules of thumb vs. feeding ML model some examples.

Link to Original Video

ML Usefulness to a Dev

• Reduce time spent programming, e.g. manually crafted spellchecker with rules of thumb vs. feeding ML model some examples.