Basler Camera User Manual page 156

Image Acquisition Control
An important thing to keep in mind is a common mistake new camera users
frequently make when they are working with exposure time. They will often use a
very long exposure time without realizing that this can severely limit the camera's
maximum allowed frame rate. As an example, assume that your camera is set to
use a 1/2 second exposure time. In this case, because each frame acquisition will
take at least 1/2 second to be completed, the camera will only be able to acquire
a maximum of two frames per second. Even if the camera's nominal maximum
frame rate is, for example, 100 frames per second, it will only be able to acquire
two frames per second because the exposure time is set much higher than
normal.
For more information about Image ROI settings, see Section 8.5 on
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AW00123402000
page 185.
Basler ace USB 3.0