Multiple inline scripts:
<script type="text/javascript">/* some codeblock 1 */</script>
<script type="text/javascript">/* some codeblock 2 */</script>
<script type="text/javascript">/* some codeblock 3 */</script>
Single conjoined inline script:
<script type="text/javascript">
/* some codeblock 1 */
/* some codeblock 2 */
/* some codeblock 3 */
</script>
are multiple inline scripts slower?
If you’re talking abut writing the code in the actual HTML, rather than loading external JS then the answer is that it really doesn’t matter.
…if browsers try to handle requests at 60fps for visual stimulus, changing as needed…
…then the difference of a few microseconds isn’t going to have a large impact.
On really old browsers, if you tried to write really a lot of code (perhaps thousands of lines per tag, or tens of thousands of lines per tag), then having multiples might make a noticeable difference… …but having a single element would still be stupid-slow in that case.