It is a pity, but I have to admit, that Magento 2 has issues in layout generation process. You'll learn during the talk about the benefits of compiling XML structures into PHP code, and even use the compilation of PHP code into PHP code to speed up your modules complex logic.

1. MAGENTO 2
LAYOUT AND CODE COMPILATION
FOR PERFORMANCE
by Ivan Chepurnyi

2. WHAT? COMPILATION?

3. COMPLEX ALGORITHMSSIMPLE

4. WHAT MAKES THEM COMPLEX?

5. REPEATED DATA PROCESSING
// ... some xml/json/yaml file initialization
foreach ($loadedData as $item) {
$this->process($item);
}

6. NESTED LOOPS
foreach ($data as $item) {
$row = [];
foreach ($columns as $column) {
$row[] = $column->export($item);
}
$csv->write($row);
}

7. COMPLEX DEPENDENCY TREE
class ClassOne
{
public function __construct(ClassTwo $dependency) {}
}
class ClassTwo
{
public function __construct(ClassThree $dependency) {}
}
class ClassThree
{
public function __construct(ClassFour $dependencyOne, ClassFive $dependen
}
// ..

8. HOW CAN WE SOLVE IT?

9. REPEATED DATA PROCESSING
Translate your XML/JSON/YAML file into executable PHP
code and include it when you need processed structure

10. NESTED LOOPS
Pre-compile second loop and execute it within the main one

11. COMPLEX DEPENDENCY TREE
Resolve dependencies and compile resolution into
executable code

12. BUT COMPILATION LOOKS UGLY...
You need to create PHP code within PHP code
You need to write it to external file
You need to include that file inside of your code

13. I WAS LOOKING FOR A LIBRARY
Didn't find one... So I wrote it myself.

14. ECOMDEVCOMPILER
Created to wrap writing PHP code within PHP
Automatically stores compiled code
Automatically validates source and re-compiles code
when needed
Provides easy to use API to create parsers, builders and
executors

15. INSTALLATION
1. Available as a composer dependency
2. Instantiate it directly or via DI container.
composer require "ecomdev/compiler"

16. SOME EXAMPLES

17. COMPILE XML INTO PHP

18. XML FILE
<objects>
<item id="object_one" type="object" />
<item id="object_two" type="object" />
<item id="object_three" type="object" />
<type id="object" class="SomeClassName"/>
</objects>

19. PARSER
use EcomDevCompilerStatementBuilder;
class Parser implements EcomDevCompilerParserInterface
{
// .. constructor with builder as dependency
public function parse($value)
{
$xml = simplexml_load_string($value);
$info = $this->readXml($xml);
return $this->getPhpCode($info, $this->builder);
}
// .. other methods
}

20. PARSE XML DATA
private function readXml($xml)
{
$info = [];
foreach ($xml->children() as $node) {
if ($node->getName() === 'type') {
$info['types'][(string)$node->id] = (string)$node->class;
} elseif ($node->getName() === 'object') {
$info['objects'][(string)$node->id] = (string)$node->type;
}
}
return $info;
}

21. CREATE PHP CODE
private function getPhpCode($info, $builder) {
$compiledArray = [];
foreach ($info['objects'] as $objectId => $type) {
$compiledArray[$objectId] = $builder->instance($info['types'][
}
return $builder->container(
$builder->returnValue($compiledArray)
);
}

22. COMPILED PHP FILE
return [
'object_one' => new SomeClassName(),
'object_two' => new SomeClassName(),
'object_three' => new SomeClassName()
];

23. NESTED LOOP SIMPLIFYING

24. YOUR CONSTRUCTOR
public function __construct(
EcomDevCompilerBuilder $builder,
EcomDevCompilerCompiler $compiler)
{
$this->builder = $builder;
$this->compiler = $compiler;
}

25. EXPORT METHOD
public function export($data, $columns)
{
$statements = $this->compileColumns($columns, $this->builder);
$source = new EcomDevCompilerSourceStaticData(
'your_id', 'your_checksum', $statements
);
$reference = $this->compiler->compile($source);
$closure = $this->compiler->interpret($reference);
foreach ($data as $item) {
$row = $closure($item, $columns);
}
}

26. COMPILATION METHOD
public function compileColumns($columns, $builder)
{
$item = $builder->variable('item');
$compiledArray = [];
foreach ($columns as $id => $column) {
$compiledArray[] = $builder->chainVariable('columns')[$id]
->export($item);
}
$closure = $builder->closure(
[$item, $builder->variable('columns')],
$builder->container([$builder->returnValue($compiledArray)])
);
return $builder->container([$builder->returnValue($closure)]);
}

27. RESULT
return function ($item, $columns) {
return [
$columns['id1']->export($item),
$columns['id2']->export($item),
$columns['id3']->export($item),
// ...
];
};

28. MAIN COMPONENTS
CompilerInterface - Compiler instance
StorageInterface - Stores compiled files
SourceInterface - Provider of data (File, String,
StaticData)
ParserInterface - Parser of data
ObjectBuilderInterface - Bound builder for included files

29. AND SOME SWEET STUFF...

30. EXPORTABLE OBJECTS
class SomeClass implements EcomDevCompilerExportableInterface
{
public function __construct($foo, $bar) { /* */ }
public function export() {
return [
'foo' => $this->foo,
'bar' => $this->bar
];
}
}
Will be automatically compiled into:
new SomeClass('fooValue', 'barValue');

31. MAGENTO 2.0
LAYOUT COMPILATION IS A MUST

32. WHY? BECAUSE OF ITS ALGORITHM

33. LAYOUT CACHING
Every handle that is added to the
MagentoFrameworkViewResult changes the cache key
for the whole generated structure.

34. LAYOUT GENERATION
Scheduled structure is generated from XML object at all
times

35. SOLUTION
1. Make every handle a compiled php code
2. Include compiled handles at loading phase

36. GOOD NEWS
I am already working on it
Will be release in April 2016

37. GITHUB
COMPILER LIBRARY FOR M2
https://github.com/EcomDev/compiler
LAYOUT COMPILER FOR M1
https://github.com/EcomDev/EcomDev_LayoutCompiler
LAYOUT COMPILER FOR M2
Coming soon

38. Q&A
@IvanChepurnyi
ivan@ecomdev.org