I've acted as project manager (and lead developer) for quite a few projects that were user-oriented. Some were web apps, some were client/server database query apps, etc.. All tend to be multiperson teams with hundreds of thousands of lines of code, and development time spanning months.
Usually a rough working prototype is constructed -- even if it's just a first pass at one of the screens. Slapped together in a fraction of the time it takes to complete the app, I try to get the performance to within half an order of magnitude that the final application needs to perform.
If my team can get the app to work in 5 seconds where a 1-second response time is needed -- that's great. We discuss the potential points of optimization (there's always some) and then we start to code using that design without the optimizations. The person assigned to the code where the handwaving took place is given some idea of what will be done ("this will be memoized/cached", "just code this query the way it is, we've got something better later", "we've got a clever hack for this, don't sweat it now") but is told to code it in the most straightforward way possible for debugging and unit testing.
Near the end of a project, sure we'll go back and tweak the application to get every ounce of speed. By then the hardware's been upgraded, the libraries have improved, we've found the flaws in the design, and most of the code's been debugged. But in the beginning, this is generally what I do and it hasn't failed yet.
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.