I routinely use hashes of 50K or 100K keys and sometimes several at once! This is not an issue if you have enough memory. Also, the Perl hash table is very efficient performance wise. If you know what you are looking for, no other data structure is as efficient.
I suspect that your trouble will be the same as mine. Where does this stuff that goes into the hash come from? In my case the data comes from text files and the "care and feeding" of these text files just dwarfs any hash table initialization or should I say that getting the data off the disk and ready to be inserted into the hash and creating the text output files is what takes the VAST majority of the MIPs, split(), regex and such. I/O is "expensive". Anyway 50K keys is not what I would consider a huge hash. If your app gets slow, then look at your I/O stuff and benchmark it. You can make some significant performance gains there with some experimentation.
Anyway I/O is gonna be the performance problem, not the hash itself.
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.