apache timeout

Hi. We are running a webserver through 256k adsl on a PII 300 with 128Mb RAM. At certain peak times, our visitors get timeout messages. From /var/log/httpd it seems to happen when requests are very close to each other. Anything more frequent than one request a minute seems to produce the timeout. Is there anything I can tweak Apache with or is this time to upgrade the hardware. If so, what do I buy first, bandwidth, ram or WHY. SuSE 8.0 apt-gett'd yesterday. Thanks, Steve.