What are possible reasons for external keyboard input lag?

The Local Storage and the SQLite are there to provide the proposed (W3C) Web Storage, and Web SQL Database, originally intended for the HTML5 spec.

From Wikipedia:

Web Storage and DOM Storage (Document Object Model) are web application software methods and protocols used for storing data in a web browser. Web storage supports persistent data storage, similar to cookies, as well as window-local storage.

Web storage offers two different storage areas—local storage and session storage—which differ in scope and lifetime. Data placed in local storage is per domain (it's available to all scripts from the domain that originally stored the data) and persists after the browser is closed.

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Web SQL Database is a web page API for storing data in databases that can be queried using a variant of SQL.

The API is supported by Google Chrome, Opera and Safari, but will not be implemented by Mozilla Firefox which instead supports the Indexed Database API.

The W3C Web Applications Working Group ceased working on the specification in November 2010, citing lack of independent implementations (not using SQLite as the backend) as the reason the specification could not move forward to become a W3C Recommendation.

texlive doesn't activate the map-file of the fonts. Compiling your example with pdflatex would give errors as pdflatex would not be able to find the ttf. xelatex can find the fonts but due to the missing map-file the encoding is wrong and so you get faulty/missing glyph.

To correct the problem for both engines call on a command line

 updmap-sys --enable Map=tengwarscript.map

Then a compilation with xelatex and pdflatex should work and give this

It's probable that the bash on your CentOS 5.6 machine is version 3. Zero-filling of integers in brace expansions was introduced in version 4 of bash.

The solution would be to either update your installation of bash to a more recent version, or to use an alternative way of generating the zero-filled integers, like

printf '%02d\n' {8..10}

Alternatively, something along the lines of

for i in 0{1..9} {10..20}; do
    echo "$i"
done

will also work.