It's certainly possible to get a beachball while opening several resource-intensive apps simultaneously.
Use
iStat Pro (free) or
iStat Menus ($16) to get accurate readings of your battery, temps, fan speeds and much more.
If your fans are spinning up without increased heat, try
resetting the SMC.
If there is increased heat, follow every step of the following instructions precisely. Do not skip any steps.
- Launch Activity Monitor
- Change "My Processes" at the top to "All Processes"
- Click on the "% CPU" column heading once or twice, so the arrow points downward (highest values on top).
(If that column isn't visible, right-click on the column headings and check it, NOT "CPU Time")
- Click on the System Memory tab at the bottom.
- Take a screen shot of the entire Activity Monitor window, then scroll down to see the rest of the list, take another screen shot
- Post your screenshots.